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.

Science•Key Stage 4 / GCSE (Ages 14-16)•Lightintermediate

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Exploring the Science of Light

Key Stage 4 / GCSE - Intermediate Level

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Instructions: This worksheet will guide you through various aspects of light, including its properties, behaviour, and applications. You will engage with data analysis, problem-solving, and conceptual understanding to deepen your knowledge of light.

Understanding Reflection and Refraction

Read each question carefully and use your knowledge of light to answer. Consider the behaviour of light when it encounters different surfaces and materials.

1. Describe how light behaves when it hits a smooth, shiny surface.

2. Explain the difference between reflection and refraction.

3. What is the angle of incidence if the angle of reflection is 35°?

Calculating the Speed of Light in Different Media

Use the refractive index to calculate the speed of light in various media. Remember that the speed of light in a vacuum is approximately 3.00 x 10^8 m/s.

1. Calculate the speed of light in water (n = 1.33).

2. Calculate the speed of light in glass (n = 1.50).

3. Calculate the speed of light in diamond (n = 2.42).

Exploring the Electromagnetic Spectrum

Analyse the table of electromagnetic waves and answer the questions below. Consider their properties and uses.

Wave Type	Wavelength Range	Frequency Range	Common Uses
Radio Waves	>1 mm	<3 x 10^9 Hz	Broadcasting
Microwaves	1 mm - 1 cm	3 x 10^9 - 3 x 10^11 Hz	Heating
Infrared	700 nm - 1 mm	3 x 10^11 - 4 x 10^14 Hz	Thermal Imaging
Visible Light	400 nm - 700 nm	4 x 10^14 - 7.5 x 10^14 Hz	Vision
Ultraviolet	10 nm - 400 nm	7.5 x 10^14 - 3 x 10^16 Hz	Fluorescent Lamps

1. Which wave type has the highest frequency?

2. What is the common use of microwaves?

3. Which wave type is used in thermal imaging?

Investigating Lenses

Answer the following questions about lenses. Consider how lenses bend light and their applications in everyday life.

1. Describe the difference between a convex lens and a concave lens.

2. Explain how a convex lens can be used to correct vision.

3. What type of image is formed by a concave lens?

Problem Solving with Snell's Law

Use Snell's Law (n1 sin θ1 = n2 sin θ2) to solve these problems. Assume you have the necessary angles and refractive indices.

1. Light enters water from air at an angle of 30°. Calculate the angle of refraction. (n_air = 1.00, n_water = 1.33)

2. A light ray passes from glass to air. If the angle of incidence is 40°, what is the angle of refraction? (n_glass = 1.50)

Extended Writing: The Nature of Light

Write a detailed essay discussing the dual nature of light. Include examples of experiments that demonstrate light behaving as both a wave and a particle.

Discuss the dual nature of light, providing examples of experiments such as Young's double-slit experiment and the photoelectric effect. Explain how these experiments support the wave-particle duality of light. [10 marks]

Answer Key

Activity 1: Light reflects off a smooth surface at the same angle it hits it; Reflection is the bouncing back of light, while refraction is the bending of light; 35°

Activity 2: 2.26 x 10^8 m/s; 2.00 x 10^8 m/s; 1.24 x 10^8 m/s

Activity 3: Ultraviolet; Heating; Infrared

Activity 4: Convex lenses are thicker in the middle, concave lenses are thinner; Convex lenses converge light to focus on the retina; Virtual image

Activity 5: 22.1°; 60.0°

Activity 6: Essay will vary, but should include discussion of wave-particle duality, Young's experiment, and the photoelectric effect