Light Worksheet - GCSE - Intermediate
Light worksheet for Key Stage 4 / GCSE (Ages 14-16). Intermediate level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.
Exploring the Science of Light
Key Stage 4 / GCSE - Intermediate Level
Instructions: This worksheet delves into the fascinating topic of light, exploring its properties, behaviour, and applications. Complete each activity to deepen your understanding of how light interacts with the world around us.
Understanding Light Refraction
Read the scenario and answer the questions. Consider how light bends when it passes through different media.
A light ray passes from air into water at an angle of 30°. The refractive index of water is 1.33.
1. Calculate the angle of refraction using Snell's Law.
2. Explain why light bends towards the normal when entering a denser medium.
Exploring the Electromagnetic Spectrum
Study the electromagnetic spectrum table and answer the questions below. Focus on the properties and uses of different types of electromagnetic waves.
| Type | Wavelength Range | Frequency Range | Uses |
| Radio Waves | >1m | <3x10^9 Hz | Communication |
| Microwaves | 1mm-1m | 3x10^9-3x10^11 Hz | Cooking |
| Infrared | 700nm-1mm | 3x10^11-4x10^14 Hz | Remote Controls |
| Visible Light | 400-700nm | 4x10^14-7.5x10^14 Hz | Vision |
1. Which type of wave has the highest frequency?
2. Describe one use of infrared waves.
The Nature of Light: Wave or Particle?
Write a short essay discussing whether light behaves as a wave or a particle. Use examples from experiments such as the double-slit experiment and photoelectric effect.
Discuss the dual nature of light, providing examples of experiments that demonstrate its wave and particle properties. [6 marks]
Calculating Speed of Light in Different Media
Use the given refractive indices to calculate the speed of light in various media. Remember, the speed of light in a vacuum is approximately 3x10^8 m/s.
1. Calculate the speed of light in glass (n = 1.5).
2. Calculate the speed of light in diamond (n = 2.42).
Investigating Reflection and Mirrors
Answer the questions based on the laws of reflection. Consider how light interacts with different surfaces.
1. If a light ray strikes a plane mirror at an angle of 45°, what is the angle of reflection?
2. Why do mirrors reverse images left to right but not top to bottom?
Exploring Lenses and Image Formation
Complete the ray diagram for a converging lens and answer the questions about image formation.
1. Draw a ray diagram to show how a converging lens forms an image of an object placed beyond the focal point.
2. Describe the nature of the image formed (real/virtual, upright/inverted, magnified/reduced).
Understanding Polarisation of Light
Explain the concept of polarisation and its applications in everyday life. Provide examples where polarised light is used.
Describe how polarisation occurs and give two examples of its applications, such as in sunglasses and photography. [4 marks]
Analysing Light Intensity and Distance
Use the inverse square law to solve problems related to light intensity and distance. Show all your calculations.
1. A light source has an intensity of 1000 lux at 2 metres. What is the intensity at 4 metres?
2. Explain how the inverse square law applies to the intensity of light from a point source.
Activity 1: 22.09° ; Light bends towards the normal because it slows down entering a denser medium.
Activity 2: Ultraviolet ; Infrared waves are used in remote controls.
Activity 3: Dual nature of light demonstrated by experiments like the double-slit and photoelectric effect.
Activity 4: 2x10^8 m/s ; 1.24x10^8 m/s
Activity 5: 45° ; Mirrors reverse images left to right due to the way our brain interprets reflected light.
Activity 6: Ray diagram shows real, inverted, reduced image ; Real, inverted, reduced.
Activity 7: Polarisation occurs when waves oscillate in one direction; used in sunglasses, photography.
Activity 8: 250 lux ; Intensity decreases with the square of the distance from the source.
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