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Year 8 - Science

The visible spectrum

Making images

Unit Summary

This unit explores the transmission of light, including absorption, scattering, and reflection, and the use of the ray model in imaging, refraction, and lenses. It also covers energy transfer in various processes, using safe techniques, making accurate observations, and improving reliability.

Lesson Summary

You will learn to describe what white light is, and explain why a visible spectrum can be produced from white light.

Key Notes

  • White light from the Sun and light bulbs consists of light of all the colours in the visible light spectrum (a rainbow).
  • A transparent triangular prism can split up sunlight into a visible light spectrum.
  • The visible light spectrum shows the range of colours that light can have.
  • Cone cells in the eye detect colour. There are 3 kinds (R, G and B); each is sensitive to a range of colours of light.
  • The colour we see depends on which cone cells are triggered to send a signal to the brain.

Vocabulary To Learn

  • white light: Light that consists of red, green and blue light in equal amounts so looks white.
  • triangular prism: A uniform 3D shape with triangular ends.
  • visible light spectrum: A rainbow pattern of coloured light that always occurs with the colours in the same order.
  • cone cells: The cells at the back of the eye that detect colour.

Common Mistakes To Avoid

  • Sunlight is yellow(ish), not white.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

White light from the Sun and light bulbs consists of light of all the colours in the visible light spectrum (a rainbow). A transparent triangular prism can split up sunlight into a visible light spectrum.

2. Define this scientific word and use it in context. 'white light'

Light that consists of red, green and blue light in equal amounts so looks white. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Sunlight is yellow(ish), not white. Correction: Show pupils a yellow light (and illuminate white paper beneath a yellow light) and compare it to sunlight to show that sunlight is white.

More Lessons In This Unit

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