Light Worksheet - A-Level - Intermediate

Light worksheet for A-Level / Vocational (Ages 16-18). Intermediate level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Science•A-Level / Vocational (Ages 16-18)•Lightintermediate

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Exploring the Science of Light

A-Level Science (Ages 16-18) - Intermediate Difficulty

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Instructions: This worksheet delves into the fascinating topic of light, exploring its properties, behaviours, and applications. Each activity is designed to challenge your understanding and encourage deeper analysis of how light interacts with the world around us.

Properties of Light

Examine the fundamental properties of light. Answer the questions by applying your knowledge of wave-particle duality, speed of light, and light's interaction with different media.

1. Describe the wave-particle duality of light and provide an example of an experiment that demonstrates this concept.

2. Calculate the speed of light in a medium with a refractive index of 1.5. (Speed of light in vacuum = 3.00 x 10^8 m/s)

Reflection and Refraction

Explore how light behaves when it encounters different surfaces. Use Snell's Law to solve the problems related to refraction and reflection.

1. A light ray strikes a mirror at an angle of 30°. What is the angle of reflection?

2. A light ray passes from air into water at an angle of incidence of 45°. Calculate the angle of refraction. (Refractive index of water = 1.33)

Optical Instruments

Analyse the functioning of optical instruments such as lenses and mirrors. Apply the lens formula and magnification concepts to solve the following problems.

1. A convex lens has a focal length of 10 cm. An object is placed 15 cm from the lens. Calculate the image distance and describe the nature of the image formed.

2. A concave mirror forms an image 20 cm from the mirror when an object is placed 30 cm away. Determine the focal length of the mirror.

Light and Colour

Investigate how light interacts with materials to produce colour. Answer the questions based on your understanding of the visible spectrum and colour perception.

1. Explain why a red apple appears red under white light but appears black under green light.

2. Describe the process of dispersion and how it leads to the formation of a rainbow.

Polarisation of Light

Understand the concept of light polarisation and its applications. Use your knowledge to answer the questions about polarisation techniques and their uses.

1. What is polarisation of light, and how can it be achieved using a polaroid filter?

2. Describe one practical application of polarised light in everyday life.

Light as a Wave

Explore the wave nature of light through interference and diffraction. Solve the problems using principles of wave interference.

1. Two coherent light sources produce an interference pattern on a screen. If the wavelength of light is 600 nm and the distance between the slits is 0.1 mm, calculate the fringe separation on the screen 1 m away.

2. Describe how diffraction affects the resolution of optical instruments.

Answer Key

Activity 1: Wave-particle duality is demonstrated by the double-slit experiment ; 2.00 x 10^8 m/s

Activity 2: 30° ; 32.1°

Activity 3: Image distance = 30 cm, real and inverted ; Focal length = 12 cm

Activity 4: A red apple absorbs all colours except red, which it reflects ; Dispersion occurs when light is refracted at different angles for different wavelengths, forming a rainbow

Activity 5: Polarisation is the orientation of light waves in a particular direction, achieved using a polaroid filter ; Used in sunglasses to reduce glare

Activity 6: Fringe separation = 6 mm ; Diffraction limits resolution by causing light to spread out, reducing clarity