Thin Lenses

Types of Lenses and Effects on Light

By the end of the lesson, the learner should be able to:
Define a lens and distinguish between convex and concave lenses; Describe the effect of lenses on parallel rays of light; Explain convergence and divergence of light rays; Identify practical examples of different lens types

Q/A on refraction concepts; Experiment 1.1 - investigating effects of lenses on parallel rays using sunlight and ray box; Demonstration of convergence and divergence; Group identification of lens types in everyday objects; Drawing and analysis of ray diagrams

Ray box; Various convex and concave lenses; White screen; Plane mirror; Card with parallel slits; Sunlight or strong lamp

KLB Secondary Physics Form 4, Pages 1-6

Thin Lenses

Definition of Terms and Ray Diagrams
Image Formation by Converging Lenses

By the end of the lesson, the learner should be able to:
Define centre of curvature, principal axis, optical centre, principal focus and focal length; Distinguish between real and virtual focus; State and apply the three important rays for lens diagrams; Construct basic ray diagrams for lenses

Q/A review of lens effects; Guided discovery of lens terminology using practical demonstrations; Step-by-step construction of ray diagrams using the three important rays; Practice drawing ray paths for parallel rays, rays through focus, and rays through optical centre; Group work on ray diagram construction

Various lenses; Rulers; Graph paper; Ray boxes; Charts showing lens terminology; Drawing materials; Laser pointers (if available)
Converging lenses; Objects; White screen; Metre rule; Candle; Graph paper; Charts showing applications; Camera (if available)

KLB Secondary Physics Form 4, Pages 3-8

Thin Lenses

Image Formation by Diverging Lenses and Linear Magnification
The Lens Formula
Determination of Focal Length I

By the end of the lesson, the learner should be able to:
Construct ray diagrams for diverging lenses; Explain why diverging lenses always form virtual, erect, diminished images; Define linear magnification and derive its formula; Calculate magnification using height and distance ratios; Solve Examples 1, 2, and 3 from textbook

Q/A on converging lens images; Ray diagram construction for diverging lenses; Mathematical derivation of magnification formulae; Step-by-step solution of textbook examples; Scale drawing practice; Group problem-solving on magnification calculations

Diverging lenses; Graph paper; Rulers; Calculators; Examples from textbook; Objects of known heights; Measuring equipment
Mathematical instruments; Charts showing derivation; Calculators; Worked examples; Sign convention chart; Practice worksheets
Converging lenses; Lens holders; Metre rule; White screen; Distant objects; Plane mirror; Pins; Cork; Glass rod; Light source; Cardboard with cross-wires

KLB Secondary Physics Form 4, Pages 11-14

Thin Lenses

Determination of Focal Length II
Power of Lens and Simple Microscope

By the end of the lesson, the learner should be able to:
Determine focal length using lens formula method (Experiment 1.4); Plot and analyze 1/u vs 1/v graphs; Determine focal length from displacement method (Experiment 1.5); Solve Examples 8, 9, and 10 involving graphical methods

Review of previous focal length methods; Setup and performance of Experiment 1.4; Data collection and graph plotting; Analysis of Examples 8-10; Introduction to displacement method and conjugate points; Practical work with different graphical approaches

Experimental setup materials; Graph paper; Calculators; Data tables; Examples 8-10 from textbook; Materials for displacement method
Various lenses of different focal lengths; Magnifying glasses; Small objects; Calculators; Power calculation charts; Small print materials; Biological specimens

KLB Secondary Physics Form 4, Pages 19-25

Thin Lenses

Compound Microscope
The Human Eye
Defects of Vision

By the end of the lesson, the learner should be able to:
Describe structure and working of compound microscope; Explain functions of objective lens and eyepiece; Calculate total magnification; Solve Example 11 involving lens separation; Understand normal adjustment of compound microscope
Describe short sight (myopia) and its causes; Explain correction of myopia using diverging lenses; Describe long sight (hypermetropia) and its causes; Explain correction of hypermetropia using converging lenses; Draw ray diagrams showing defects and their corrections

Review of simple microscope; Introduction to compound microscope structure; Ray tracing through objective and eyepiece; Mathematical analysis of total magnification; Step-by-step solution of Example 11; Practical demonstration with microscope parts
Q/A on normal vision and accommodation; Analysis of myopia - causes, effects, and correction; Ray diagrams for uncorrected and corrected myopia; Study of hypermetropia - causes, effects, and correction; Ray diagrams for uncorrected and corrected hypermetropia; Demonstration using appropriate lenses

Compound microscope; Charts showing microscope structure; Lenses representing objective and eyepiece; Calculators; Example 11 from textbook; Ray tracing materials
Charts/models of human eye; Torch for demonstrations; Eye model with flexible lens; Objects at various distances; Measuring equipment; Camera comparison charts
Charts showing vision defects; Converging and diverging lenses; Eye models; Spectacles with different lenses; Vision test materials; Ray diagram materials

KLB Secondary Physics Form 4, Pages 28-30
KLB Secondary Physics Form 4, Pages 32-33

Thin Lenses

The Camera and Applications Review

By the end of the lesson, the learner should be able to:
Describe camera structure and working principles; Explain functions of camera lens, shutter, aperture, and film; Compare camera with human eye highlighting similarities and differences; Review all applications of lenses in optical instruments

Review of optical instruments studied; Analysis of camera components and their functions; Detailed comparison of camera and eye; Discussion of focusing mechanisms; Comprehensive review of lens applications in telescope, microscope, camera, spectacles, and magnifying glass

Camera (if available); Charts showing camera structure; Comparison tables; Review charts of all applications; Summary materials; Demonstration equipment

KLB Secondary Physics Form 4, Pages 33-35

Uniform Circular Motion

Introduction and Angular Displacement
Angular Velocity and Linear Velocity

By the end of the lesson, the learner should be able to:
Define uniform circular motion and give examples; Define angular displacement and its unit (radian); Convert between degrees and radians; Derive the relationship s = rθ; Solve Example 1 from textbook

Q/A on linear motion concepts; Introduction to circular motion using real-life examples (merry-go-round, wheels, planets); Definition and demonstration of angular displacement; Mathematical relationship between arc length, radius and angle; Practical measurement of angles in radians; Solution of Example 1

Merry-go-round model or pictures; String and objects for circular motion; Protractors; Calculators; Charts showing degree-radian conversion; Measuring wheels
Stopwatch; Rotating objects (turntables, wheels); String and masses; Calculators; Formula charts; Examples from textbook; Measuring equipment

KLB Secondary Physics Form 4, Pages 37-39

Uniform Circular Motion

Centripetal Acceleration

By the end of the lesson, the learner should be able to:
Explain why circular motion involves acceleration despite constant speed; Derive centripetal acceleration formula a = v²/r = rω²; Understand direction of centripetal acceleration; Solve Example 3 from textbook; Apply acceleration concepts to circular motion problems

Q/A review of velocity and acceleration concepts; Explanation of acceleration in circular motion using vector analysis; Mathematical derivation of centripetal acceleration; Discussion of acceleration direction (toward center); Step-by-step solution of Example 3; Practical demonstration of centripetal acceleration effects

Vector diagrams; Rotating objects; Calculators; Charts showing acceleration derivation; Example 3 materials; Demonstration of circular motion with varying speeds

KLB Secondary Physics Form 4, Pages 40-42

Uniform Circular Motion

Centripetal Force and Factors Affecting It
Experimental Investigation of Centripetal Force

By the end of the lesson, the learner should be able to:
Explain the need for centripetal force in circular motion; State factors affecting centripetal force (mass, speed, radius); Derive centripetal force formula F = mv²/r = mrω²; Perform Experiment 2.1 investigating F vs ω²; Solve Example 4 from textbook
Perform Experiment 2.2 investigating speed vs radius relationship; Plot graphs of F vs ω² and v² vs r; Analyze experimental results and draw conclusions; Understand the relationship F ∝ mv²/r; Apply experimental findings to solve problems

Review of Newton's laws and centripetal acceleration; Introduction to centripetal force concept; Experimental investigation of factors affecting centripetal force; Performance of Experiment 2.1 - relationship between F and ω²; Data collection and analysis; Solution of Example 4; Discussion of practical implications
Q/A on previous experiment results; Setup and performance of Experiment 2.2 - variation of speed with radius; Data collection for different radii; Graph plotting and analysis; Verification of theoretical relationships; Group analysis of experimental errors and improvements; Application of results to problem solving

Metal pegs; Turntable and motor; Variable resistor; Dry cell; Metal ball and string; Spring balance; Clock; Graph paper; Calculators
Same apparatus as Experiment 2.1; Graph paper; Additional measuring equipment; Data recording tables; Calculators; Analysis worksheets

KLB Secondary Physics Form 4, Pages 42-47
KLB Secondary Physics Form 4, Pages 44-47

Uniform Circular Motion

Case Examples - Cars and Banking
Case Examples - Cyclists and Conical Pendulum

By the end of the lesson, the learner should be able to:
Explain circular motion of cars on level roads; Understand role of friction in providing centripetal force; Describe banking of roads and its advantages; Derive critical speed for banked tracks; Explain aircraft banking principles

Review of centripetal force concepts; Analysis of car motion on circular bends; Discussion of friction as centripetal force; Introduction to banked roads and critical speed; Mathematical analysis of banking angles; Explanation of aircraft banking mechanisms; Problem-solving involving banking situations

Model cars and tracks; Inclined plane demonstrations; Charts showing banking principles; Calculators; Friction demonstration materials; Pictures of banked roads and aircraft
Model cyclists; Pendulum apparatus; String and masses; Force diagrams; Calculators; Example 5 materials; Protractors for angle measurement

KLB Secondary Physics Form 4, Pages 47-50

Uniform Circular Motion

Motion in Vertical Circle

By the end of the lesson, the learner should be able to:
Analyze forces in vertical circular motion; Understand variation of tension at different positions; Derive expressions for tension at top and bottom positions; Calculate minimum speed for vertical circular motion; Apply concepts to practical examples (bucket of water, loop-the-loop)

Review of circular motion in horizontal plane; Introduction to vertical circular motion; Force analysis at different positions in vertical circle; Mathematical derivation of tension variations; Discussion of minimum speed requirements; Practical examples and safety considerations; Problem-solving involving vertical motion

String and masses for vertical motion; Bucket and water (demonstration); Model loop-the-loop track; Force analysis charts; Safety equipment; Calculators

KLB Secondary Physics Form 4, Pages 52-54

Uniform Circular Motion

Applications - Centrifuges and Satellites

By the end of the lesson, the learner should be able to:
Explain working principles of centrifuges; Describe separation of particles using centripetal force; Understand satellite motion and gravitational force; Apply Newton's law of gravitation to satellite orbits; Explain parking orbits and their applications

Q/A on centripetal force applications; Detailed study of centrifuge operation; Analysis of particle separation mechanisms; Introduction to satellite motion; Application of universal gravitation law; Discussion of geostationary satellites; Analysis of satellite velocities and orbital periods

Centrifuge model or pictures; Separation demonstration materials; Satellite orbit charts; Calculators; Newton's gravitation materials; Model solar system

KLB Secondary Physics Form 4, Pages 54-55

Floating and Sinking

Introduction and Cause of Upthrust
Upthrust in Gases and Archimedes' Principle
Law of Flotation and Applications

By the end of the lesson, the learner should be able to:
Explain why objects feel lighter in fluids; Define upthrust and identify its effects; Perform Experiment 3.1 investigating upthrust and weight of fluid displaced; Derive mathematical expression for upthrust using pressure concepts; Verify Archimedes' principle experimentally
Explain upthrust in gases with examples; State Archimedes' principle clearly; Apply Archimedes' principle to solve problems; Solve Examples 1, 2, and 3 from textbook; Calculate apparent weight and upthrust in different fluids

Q/A on pressure in liquids; Introduction using steel ferry floating on water; Performance of Experiment 3.1 - relationship between upthrust and weight of displaced fluid; Mathematical derivation of upthrust U = ρVg; Analysis of experimental results; Discussion of pressure differences causing upthrust
Review of upthrust in liquids through Q/A; Discussion of upthrust in gases using balloon examples; Statement and explanation of Archimedes' principle; Step-by-step solution of Examples 1-3; Problem-solving involving apparent weight calculations; Group work on upthrust calculations

Spring balance; Objects (stones); String; Eureka can; Beaker; Water; Measuring cylinder; Beam balance; Dense objects; Charts showing pressure variation
Balloons; Helium or hydrogen (if available); Objects of known density; Calculators; Examples from textbook; Different liquids for demonstration; Measuring equipment
Test tubes; Sand; Measuring cylinder; Water; Balance; Floating objects; Examples from textbook; Calculators; Model boats; Balloon demonstrations

KLB Secondary Physics Form 4, Pages 58-63
KLB Secondary Physics Form 4, Pages 60-66

Floating and Sinking

Relative Density Determination

By the end of the lesson, the learner should be able to:
Define relative density of solids and liquids; Use Archimedes' principle to determine relative density; Apply the formula: RD = Weight in air/(Weight in air - Weight in fluid); Solve Examples 8, 9, 10, 11, and 12 from textbook; Calculate relative density using different methods

Review of density concepts through Q/A; Introduction to relative density using practical examples; Mathematical derivation of relative density formulae; Step-by-step solution of Examples 8-12; Practical determination of relative density for various materials; Group calculations and comparisons

Spring balance; Various solid objects; Different liquids; Measuring cylinders; Calculators; Examples from textbook; Objects of unknown density; Data recording sheets

KLB Secondary Physics Form 4, Pages 69-74

Floating and Sinking

Archimedes' Principle and Moments

By the end of the lesson, the learner should be able to:
Perform Experiment 3.3 determining relative density using moments; Understand the principle of moments in relative density determination; Plot graphs of d₁ against d₂ and determine slopes; Apply moments method to determine relative density of liquids; Explain advantages of moments method over direct weighing

Q/A on relative density calculations; Setup and performance of Experiment 3.3 - relative density using moments; Data collection and graph plotting; Analysis of graph slopes and their significance; Application to liquids determination; Discussion of method advantages and accuracy

Metre rule; Clamps and stands; Solid objects; Metal blocks; Water and other liquids; Graph paper; Calculators; Data recording tables; Balance setup materials

KLB Secondary Physics Form 4, Pages 71-74

Floating and Sinking

Applications - Hydrometer and Practical Instruments

By the end of the lesson, the learner should be able to:
Explain the working principle of hydrometers; Describe structure and features of practical hydrometers; Solve Examples 12 and 13 involving hydrometer calculations; Understand applications in measuring density of milk, battery acid, and beer; Calculate hydrometer dimensions and floating positions

Review of law of flotation through Q/A; Detailed study of hydrometer structure and operation; Analysis of hydrometer sensitivity and design features; Step-by-step solution of Examples 12-13; Discussion of specialized hydrometers (lactometer, battery acid hydrometer); Practical calculations involving hydrometer floating

Hydrometer (if available); Different density liquids; Measuring cylinders; Calculators; Examples from textbook; Charts showing hydrometer types; Battery acid hydrometer demonstration

KLB Secondary Physics Form 4, Pages 74-77

Floating and Sinking
Electromagnetic Spectrum

Applications - Ships, Submarines, and Balloons
Introduction and Properties of Electromagnetic Waves
Production and Detection of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Explain how steel ships float on water; Describe working principle of submarines; Understand how balloons achieve lift and control altitude; Analyze the role of displaced fluid in each application; Apply principles to solve practical problems involving floating vessels
Explain production of gamma rays, X-rays, and ultraviolet radiation; Describe detection methods for high-energy radiations; Understand energy transitions in atoms and nuclei; Relate wave energy to frequency using E = hf; Solve Example 3 involving X-ray calculations

Q/A on hydrometer applications; Analysis of ship design and floating principles; Detailed study of submarine operation and ballast tanks; Exploration of balloon physics and gas density effects; Discussion of load limits and stability; Problem-solving involving practical floating applications
Review of electromagnetic properties through Q/A; Study of high-energy radiation production mechanisms; Analysis of detection methods (photographic plates, G-M tubes, fluorescent materials); Discussion of atomic and nuclear energy changes; Step-by-step solution of Example 3; Safety considerations for high-energy radiations

Model ships and submarines; Balloon demonstrations; Charts showing ship cross-sections; Submarine ballast tank models; Different density materials; Calculators; Application examples
Electromagnetic spectrum charts; Wave demonstration materials; Calculators; Radio; Mobile phone; Examples from textbook; Charts showing wave properties
Charts showing radiation production; Photographic film; Fluorescent materials; UV lamp (if available); Geiger counter (if available); Example 3 materials; Safety equipment demonstrations

KLB Secondary Physics Form 4, Pages 77
KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves II

By the end of the lesson, the learner should be able to:
Explain production of visible light, infrared, microwaves, and radio waves; Describe detection methods for each radiation type; Understand role of oscillating circuits in radio wave production; Compare detection mechanisms across the spectrum; Demonstrate detection of some radiations

Q/A on high-energy radiations; Study of lower-energy radiation production (thermal, electronic oscillations); Analysis of detection methods (eyes, thermopiles, crystal detectors, radio receivers); Practical demonstrations of infrared detection; Discussion of antenna and oscillating circuit principles; Group identification of sources and detectors

Infrared sources (heaters); Thermometer with blackened bulb; Radio receivers; Microwave oven (demonstration); Oscillating circuit models; Various electromagnetic sources

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Applications of Electromagnetic Waves I
Applications of Electromagnetic Waves II

By the end of the lesson, the learner should be able to:
Describe medical applications of gamma rays and X-rays; Explain industrial uses of high-energy radiations; Understand applications in sterilization and cancer therapy; Discuss X-ray photography and crystallography; Analyze benefits and limitations of high-energy radiation applications

Review of radiation properties and production; Detailed study of gamma ray applications (sterilization, cancer treatment, flaw detection); Analysis of X-ray applications (medical photography, security, crystallography); Discussion of controlled radiation exposure; Examination of X-ray photographs and medical applications

X-ray photographs; Medical imaging examples; Industrial radiography charts; Cancer treatment information; Sterilization process diagrams; Safety protocol charts
UV lamp demonstrations; Optical fiber samples; Infrared thermometer; Microwave oven (demonstration); Radio equipment; Remote controls; Radar images; Communication devices

KLB Secondary Physics Form 4, Pages 82-84

Electromagnetic Spectrum

Specific Applications - Radar and Microwave Cooking

By the end of the lesson, the learner should be able to:
Explain principles of radar (radio detection and ranging); Describe microwave oven operation and safety features; Understand reflection and detection in radar systems; Explain how microwaves heat food molecules; Apply wave principles to practical technologies

Review of microwave and radio wave properties; Detailed analysis of radar operation and applications; Study of microwave oven components (magnetron, stirrer, safety features); Discussion of wave reflection and detection principles; Analysis of molecular heating mechanisms; Safety considerations and precautions

Radar system diagrams; Microwave oven cross-section charts; Wave reflection demonstrations; Safety instruction materials; Magnetron information; Aircraft/ship tracking examples

KLB Secondary Physics Form 4, Pages 84-85

Electromagnetic Spectrum
Electromagnetic Induction

Hazards and Safety Considerations
Introduction and Historical Background

By the end of the lesson, the learner should be able to:
Identify hazards of high-energy electromagnetic radiations; Explain biological effects of UV, X-rays, and gamma rays; Describe safety measures for radiation protection; Understand delayed effects like cancer and genetic damage; Apply safety principles in radiation use
Define electromagnetic induction and its significance; Explain Faraday's discovery and its impact on modern technology; Understand the relationship between magnetism and electricity; Identify examples of electromagnetic induction in daily life; Appreciate the importance of relative motion in electromagnetic phenomena

Q/A on electromagnetic applications; Study of radiation hazards and biological effects; Analysis of skin damage, cell destruction, and genetic effects; Discussion of Chernobyl disaster and radiation accidents; Exploration of safety measures (shielding, distance, time limits); Application of ALARA principle (As Low As Reasonably Achievable)
Q/A on magnetic fields and electric current relationships from previous studies; Introduction to Michael Faraday's discovery and its historical significance; Discussion of electromagnetic induction examples in daily life (generators, transformers, motors); Overview of chapter content and learning objectives; Introduction to practical applications in power generation and electronics

Radiation hazard charts; Safety equipment demonstrations; Chernobyl disaster information; Biological effect diagrams; Safety protocol materials; Radiation protection examples
Charts showing Faraday's experiments; Pictures of power stations; Transformers; Generators; Historical timeline of electromagnetic discoveries; Real-world applications display

KLB Secondary Physics Form 4, Pages 85
KLB Secondary Physics Form 4, Pages 86

Electromagnetic Induction

Conditions for Electromagnetic Induction - Straight Conductor
Conditions for Electromagnetic Induction - Coils

By the end of the lesson, the learner should be able to:
Perform Experiment 5.1 using straight conductor; Identify conditions necessary for inducing e.m.f. in a straight conductor; Observe effects of different types of motion on induced current; Understand the importance of relative motion between conductor and magnetic field; Analyze galvanometer deflections

Performance of Experiment 5.1 using straight conductor AB in U-shaped magnet; Systematic investigation of conductor movement (vertical up/down, parallel to field, stationary, different angles); Observation and recording of galvanometer deflections; Analysis of current direction changes with motion reversal; Discussion of relative motion importance and field cutting concept

Thick electric conductor; U-shaped magnet; Galvanometer; Connecting wires; Clamp and stand setup; Data recording sheets
Coils of different sizes; Magnets of various strengths; Galvanometer; Connecting wires; Comparison data sheets

KLB Secondary Physics Form 4, Pages 86-87

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Rate of Change

By the end of the lesson, the learner should be able to:
Perform Experiment 5.2 investigating rate of change effects; Understand relationship between speed of motion and induced e.m.f.; Collect and analyze data on rate of flux change; Establish that faster changes produce larger e.m.f.; Apply findings to practical situations

Performance of Experiment 5.2 investigating relationship between rate of change of magnetic flux and induced e.m.f.; Systematic variation of magnet withdrawal speeds (very fast, moderate, very slow); Recording and comparison of galvanometer deflections; Data analysis and conclusion drawing; Discussion of practical implications in generators and other applications

Coil of at least 50 turns; Sensitive galvanometer; Magnet; Stopwatch; Data collection tables; Graph paper for analysis

KLB Secondary Physics Form 4, Pages 88-89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Magnetic Field Strength

By the end of the lesson, the learner should be able to:
Perform Experiment 5.3 investigating magnetic field strength effects; Understand relationship between field strength and induced e.m.f.; Control variables in electromagnetic experiments; Use electromagnets to vary field strength; Apply experimental findings to solve problems

Performance of Experiment 5.3 investigating relationship between magnetic field strength and induced e.m.f.; Setup of electromagnet with variable current control; Investigation of wire PQ movement in different field strengths; Recording galvanometer deflections for different electromagnet currents; Analysis of results and relationship establishment

U-shaped electromagnet; Variable resistor; Wire PQ; Galvanometer; Ammeter; Connecting wires; Power supply; Data recording materials

KLB Secondary Physics Form 4, Pages 89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Number of Turns
Lenz's Law and Direction of Induced Current
Fleming's Right-Hand Rule

By the end of the lesson, the learner should be able to:
Perform Experiment 5.4 investigating effect of coil turns; Understand relationship between number of turns and induced e.m.f.; Construct coils with different numbers of turns; Analyze why more turns produce larger e.m.f.; State Faraday's law of electromagnetic induction
Perform Experiment 5.5 determining direction of induced current; State Lenz's law and explain its significance; Understand energy conservation in electromagnetic induction; Predict current direction using Lenz's law; Relate Lenz's law to conservation of energy principle

Performance of Experiment 5.4 investigating relationship between number of turns and induced e.m.f.; Construction of solenoids with 60, 50, 40, 30, and 20 turns; Systematic testing with same magnet withdrawal speed; Recording and analysis of galvanometer readings; Mathematical relationship establishment; Statement of Faraday's law based on experimental evidence
Performance of Experiment 5.5(a) establishing galvanometer deflection direction; Performance of Experiment 5.5(b) investigating induced current direction with magnet movement; Analysis of current directions and magnetic pole formation; Statement and explanation of Lenz's law; Discussion of energy conservation and opposition principle; Practice in predicting current directions

Insulated copper wire; Sensitive galvanometer; Magnet; Connecting wires; Wire cutting and measuring tools; Data analysis sheets
Variable resistor; Sensitive center-zero galvanometer; Connecting wires; Coil; Magnet; Switch; Battery; Direction analysis charts
U-shaped magnet; Thick wire AB; Marked center-zero galvanometer; Hand models for rule demonstration; Example 1 setup materials; Direction analysis worksheets

KLB Secondary Physics Form 4, Pages 89-90
KLB Secondary Physics Form 4, Pages 90-93

Electromagnetic Induction

Applications of Induction Laws

By the end of the lesson, the learner should be able to:
Solve Examples 2 and 3 involving current direction; Apply Lenz's law to predict current directions in circuits; Understand induced current effects in neighboring circuits; Analyze changing magnetic fields and their effects; Use both Fleming's rule and Lenz's law in problem solving

Q/A review of Fleming's rule and Lenz's law; Step-by-step solution of Example 2 (current in conductor AB affecting nearby loop); Detailed analysis of Example 3 (magnet movement and coil current direction); Practice problems involving current direction prediction; Group work on applying both laws to various scenarios; Discussion of consistency between different methods

Examples 2 and 3 setup materials; Problem-solving worksheets; Charts showing current direction analysis; Group work materials; Calculators

KLB Secondary Physics Form 4, Pages 94-97

Electromagnetic Induction

Mutual Induction

By the end of the lesson, the learner should be able to:
Define mutual induction and demonstrate its occurrence; Perform Experiment 5.7 showing mutual induction between coils; Explain factors affecting mutual induction; Understand primary and secondary coil relationships; Discuss enhancement methods using iron cores

Q/A on electromagnetic induction principles; Introduction to mutual induction concept and definition; Performance of Experiment 5.7 demonstrating mutual induction between primary and secondary coils; Investigation of switching effects, current changes, and A.C. source effects; Analysis of mutual induction enhancement using soft iron rod and ring; Discussion of applications in transformers

Two coils P and S; Galvanometer; Battery; A.C. power source; Switch; Rheostat; Connecting wires; Soft iron rod; Soft iron ring; Enhancement demonstration materials

KLB Secondary Physics Form 4, Pages 97-100

Electromagnetic Induction

Transformers - Basic Principles

By the end of the lesson, the learner should be able to:
Describe transformer structure and components; Explain working principle based on mutual induction; Perform Experiment 5.10 investigating secondary e.m.f. variation; Understand primary and secondary coil functions; Distinguish between step-up and step-down transformers

Review of mutual induction through Q/A; Introduction to transformer structure (primary coil, secondary coil, iron core); Performance of Experiment 5.10 - variation of secondary e.m.f. with number of turns; Observation of bulb brightness changes with turn variations; Analysis of step-up vs step-down transformer characteristics; Introduction to transformer symbols and representations

Long insulated copper wire; Soft iron rod; Low frequency A.C. source; A.C. voltmeter; Switch; Bulb; Transformer construction materials; Symbol charts

KLB Secondary Physics Form 4, Pages 100-102

Electromagnetic Induction

Transformer Equations and Calculations
Transformer Energy Losses and Example 6
Applications - Generators, Microphones, and Induction Coils

By the end of the lesson, the learner should be able to:
Derive transformer turns rule equation; Apply transformer equations for voltage and current relationships; Calculate transformer efficiency; Solve Examples 4 and 5 involving transformer problems; Understand ideal vs practical transformer differences
Explain structure and working of A.C. and D.C. generators; Describe moving-coil microphone operation; Understand induction coil structure and applications; Compare slip rings with split ring commutators; Analyze generator output waveforms and applications

Q/A on transformer working principles; Mathematical derivation of turns rule (Vp/Vs = Np/Ns); Development of current relationship (IpVp = IsVs for ideal transformer); Introduction to efficiency calculations; Step-by-step solution of Examples 4 and 5; Discussion of ideal transformer assumptions vs practical limitations
Review of electromagnetic induction in rotating systems; Detailed study of A.C. generator structure and sinusoidal output; Analysis of D.C. generator with split ring commutator; Explanation of moving-coil microphone components and sound conversion; Description of induction coil operation and high voltage generation; Discussion of applications in car ignition systems

Calculators; Examples 4 and 5 materials; Mathematical derivation charts; Efficiency calculation worksheets; Transformer specification data
Charts showing energy losses; Laminated core samples; Example 6 complex setup; Power transmission diagrams; Efficiency calculation materials; Loss minimization demonstration aids
A.C. generator model; D.C. generator model; Moving-coil microphone demonstration; Induction coil setup; Output waveform charts; Slip ring and commutator comparisons; Bicycle dynamo

KLB Secondary Physics Form 4, Pages 102-105
KLB Secondary Physics Form 4, Pages 108-112

Cathode Rays and Cathode Ray Tube

Thermionic Emission
Production and Properties of Cathode Rays
Structure of Cathode Ray Oscilloscope

By the end of the lesson, the learner should be able to:

Define thermionic emission
Explain the process of electron emission from heated metals
Describe a simple experiment to demonstrate thermionic emission
State factors affecting thermionic emission

Q&A on electron structure and energy
Demonstration of thermionic emission using simple circuit
Discussion on work function of different metals
Explanation of electron emission process
Identification of materials used in cathodes

Simple thermionic emission apparatus
Low voltage power supply (6V)
Milliammeter
Evacuated glass bulb
Heated filament
Charts showing electron emission
Cathode ray tube (simple)
High voltage supply (EHT)
Fluorescent screen
Maltese cross or opaque object
Bar magnets
Charged plates
CRO (demonstration model)
Charts showing CRO structure
Diagrams of electron gun
Models of deflection plates
High voltage power supply

KLB Secondary Physics Form 4, Pages 131-132

Cathode Rays and Cathode Ray Tube

CRO Controls and Operation
CRO as a Voltmeter
Frequency Measurement using CRO

By the end of the lesson, the learner should be able to:

Explain the function of brightness and focus controls
Describe vertical and horizontal deflection systems
Explain the time base operation
Demonstrate basic CRO operation

Review of CRO structure
Demonstration of CRO controls
Explanation of time base voltage
Practice with focus and brightness adjustment
Observation of spot movement across screen

Working CRO
Signal generator
Connecting leads
Various input signals
Time base control charts
Oscilloscope manual
DC power supplies
AC signal sources
Digital voltmeter
Graph paper
Calculators
Working CRO with time base
Audio frequency generator
Graph paper for measurements
Stop watch

KLB Secondary Physics Form 4, Pages 135-137

Cathode Rays and Cathode Ray Tube

The Television Tube
Problem Solving and Applications

By the end of the lesson, the learner should be able to:

Describe the structure of a TV tube
Explain differences between CRO and TV tube
Describe magnetic deflection in TV tubes
Explain image formation in television

Q&A on CRO applications
Comparison of TV tube with CRO
Explanation of magnetic deflection coils
Description of signal processing in TV
Discussion on color TV operation

TV tube (demonstration model)
Deflection coils
TV receiver (old CRT type)
Charts comparing TV and CRO
Color TV tube diagram
Calculators
Problem-solving worksheets
Sample CRO traces
Past examination questions
Graph paper
Reference materials

KLB Secondary Physics Form 4, Pages 141-142

X-Rays

Production of X-Rays
Properties of X-Rays and Energy Concepts
Hard and Soft X-Rays
Uses of X-Rays in Medicine and Industry
Dangers of X-Rays and Safety Precautions

By the end of the lesson, the learner should be able to:

Describe the structure of an X-ray tube
Explain how X-rays are produced
State the conditions necessary for X-ray production
Identify the components of an X-ray tube and their functions

Describe medical uses of X-rays (radiography and radiotherapy)
Explain industrial applications of X-rays
Describe use in crystallography and security
Analyze the importance of point source X-rays

Q&A on cathode rays and electron beams
Drawing and labeling X-ray tube structure
Explanation of electron acceleration and collision process
Description of anode and cathode materials
Discussion on cooling systems in X-ray tubes
Review of hard and soft X-rays
Discussion on medical imaging techniques
Explanation of CT scans and their advantages
Description of industrial flaw detection
Analysis of airport security applications

Charts showing X-ray tube structure
Diagram of X-ray production process
Models of rotating anode
Pictures of medical X-ray equipment
Video clips of X-ray tube operation
Calculators
Electromagnetic spectrum chart
Energy calculation worksheets
Constants and formulae charts
Sample X-ray images
Comparison charts of hard vs soft X-rays
Penetration demonstration materials
Voltage control diagrams
Medical X-ray examples
Industrial X-ray applications
Medical X-ray images
CT scan pictures
Industrial radiography examples
Crystal diffraction patterns
Airport security equipment photos
Charts of various X-ray applications
Safety equipment samples (lead aprons)
Radiation warning signs
Pictures of X-ray protection facilities
Dosimeter badges
Charts showing radiation effects
Safety protocol posters

KLB Secondary Physics Form 4, Pages 144-145
KLB Secondary Physics Form 4, Pages 148-149

X-Rays
Photoelectric Effect
Photoelectric Effect

Problem Solving and Applications Review
Demonstration and Introduction to Photoelectric Effect
Light Energy and Quantum Theory

By the end of the lesson, the learner should be able to:

Solve numerical problems involving X-ray energy and wavelength
Apply X-ray principles to practical situations
Calculate minimum wavelength of X-rays
Evaluate advantages and limitations of X-ray technology

Review of all X-ray concepts
Problem-solving sessions on energy calculations
Analysis of real-world X-ray applications
Discussion on modern developments in X-ray technology
Assessment and evaluation exercises

Calculators
Problem-solving worksheets
Past examination questions
Real X-ray case studies
Modern X-ray technology articles
Assessment materials
UV lamp (mercury vapor)
Zinc plate
Gold leaf electroscope
Glass barrier
Metal plates
Galvanometer
Connecting wires
Electromagnetic spectrum chart
Planck's constant reference
Worked example sheets
Wave equation materials
Color filters

KLB Secondary Physics Form 4, Pages 144-149

Photoelectric Effect

Einstein's Photoelectric Equation and Work Function
Factors Affecting Photoelectric Effect

By the end of the lesson, the learner should be able to:

State Einstein's photoelectric equation
Define work function and threshold frequency
Explain the relationship between photon energy and kinetic energy
Calculate work function and threshold frequency for different metals

Q&A on quantum theory and photon energy
Derivation of Einstein's photoelectric equation
Explanation of work function concept
Worked examples using Einstein's equation
Analysis of work function table for various metals

Work function data table
Einstein's equation reference
Calculators
Metal samples (theoretical)
Energy level diagrams
Problem-solving worksheets
Experimental setup diagrams
Graph paper
Stopping potential data
Frequency vs energy graphs
Different metal characteristics

KLB Secondary Physics Form 4, Pages 153-156

Photoelectric Effect

Applications of Photoelectric Effect
Problem Solving and Applications Review

By the end of the lesson, the learner should be able to:

Describe the working of photoemissive cells
Explain photovoltaic and photoconductive cells
Analyze applications in counting, alarms, and sound reproduction
Compare different types of photoelectric devices

Q&A on factors affecting photoelectric effect
Demonstration of photocell operation
Explanation of different photoelectric device types
Analysis of practical applications in industry
Discussion on solar cells and light-dependent resistors

Photoemissive cell samples
Light-dependent resistor (LDR)
Solar panel demonstration
Application circuit diagrams
Conveyor belt counting model
Burglar alarm circuit
Calculators
Comprehensive problem sets
Past examination questions
Constants and formulae sheets
Graph paper
Assessment materials

KLB Secondary Physics Form 4, Pages 160-163