1. 10.5b Why colours change
An apple looks red in normal (white) light because it reflects red light and absorbs all the other light rays shining on it.

2. 10.5b Why colours change
Each colour in the spectrum has a different wavelength. This is why they behave differently when the waves pass through a glass prism or strike a coloured object.

3. 10.5b Why colours change
Remember, white light is made up of all the colours of the spectrum.
Can you remember them?

4. 10.5b Why colours change
If the red apple is seen in green light it looks black because the pigment in its skin absorbs all the waves, or colours, except red.
There are no red waves in green light so the apple does not reflect any light.

5. 10.5b Why colours change
What colour would Ed and Polly’s T-shirts appear
In red light?
In yellow light?
In blue light?