1. Lesson Starter
Explain what happens inside the eye of someone who is a) LONG sighted b) SHORT sighted and explain how to correct it

2. Think, Pair, Share When do you get rainbows? Why do rainbows occur?
Where have you seen a similar spread of colours?

3. Don’t stare directly at the light. Beware-bulbs may get hot!
Investigation
Shine a ray of light at a prism and move the prism until colours appear.
What colours do you see?
Are the colours always in the same order as you move the prism around?
Draw a diagram to show what your observed.
SAFETY:
Don’t stare directly at the light. Beware-bulbs may get hot!

4. When white light is refracted through a prism the colours separate out because it moves slowly through the glass this is called dispersion

5. White light is made up of 7 colours
Light moves in waves
The different colours move at different speeds
- Red light has the longest wavelength
- Violet has the shortest wavelength

6. Why do you see rainbows?
Droplets of water in the air act like prisms and split the white light from the Sun into a spectrum of different colours.

8. You can make any colour by mixing three colours
You can make any colour by mixing three colours. Do you know what the PRIMARY COLOURS are?
RED
Green
Blue

9. Mix all three and you get...
Mixing Coloured Light
Mix all three and you get...
Blue + Green + Red -> White light
Red light
Green light
Yellow light
Blue light
Red light
Magenta light
Blue light
Green light
Cyan light

10. Mixing Colours

11. Colour wheel: copy
Yellow
Red
Green
Cyan
Magenta
Blue
White