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How do we change colour? - PowerPoint PPT Presentation


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How do we change colour?. Kat Street. The Spectrum. White light is made up of many different colours. The range of colours in white light is called the spectrum. Refraction through glass or water can split white light into its spectrum. Mixing Colours. Light has three primary colours.

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Presentation Transcript
slide2

The Spectrum

  • White light is made up of many different colours.
  • The range of colours in white light is called the spectrum.
  • Refraction through glass or water can split white light into its spectrum.
slide3

Mixing Colours

  • Light has three primary colours.
  • They are:
    • Red
    • Blue
    • Green (it’s different from paintbox primary colours!)
  • Colours can be mixed to make other colours and white light.
slide4

Red

Magenta

Yellow

White

Blue

Green

Cyan

slide5

Colours we see

  • Colour filters absorb some light and only allow one colour through.

Red filter

White light (all colours)

slide6

Coloured Objects

  • Objects that reflect all the colours in white light look white, because all the colours get back to your eye.
  • Opaque objects absorb some colours and reflect others. Their colour depends on the colour they reflect. For example, green objects absorbred and blue light and reflectgreen.
  • Objects that absorb all the colours of white light look black.
slide7

?

What colour would it be in red light…?

Green box in white light

A green box in red light would appear black because it absorbs all the available colours.

Coloured Objects - questions

  • What colour would a green box be in red light?
  • Which colours do you think water absorbs? (Think about what colour deep, clear water appears to be.)
  • What colour is the light from street lamps? If you were outside at night, near a street lamp, what colour would your blue jeans appear to be?