1. Coloured Light
Dispersion
Colours
Filters
Seeing colour

2. 4.____________________________________________________________
White Light?
Shine a ray of white light at a TRIANGULAR PRISM, what do you observe?
White light is split into a 1._______ of 2.________. This effect is called 3._________.
Dispersion of white light
What causes this effect?
4.____________________________________________________________
Red refracted less than violet

3. Exercise 1: White Light Label the colours on the diagram below.
Can you think of a phrase that will help you remember the colours of the spectrum in order?

4. Exercise 2: White Light 1. What is dispersion?
2. Name the colours of the spectrum in order.
3. Which colour is refracted most moving from air to Perspex?
4. Which colour is refracted least moving from air to Perspex?
5. Give an example of dispersion in nature.

5. Exercise 3: Light Effects
A. B. C.
Reflection
Refraction
Dispersion

6. Colours There are 3 PRIMARY COLOURS, what are they? YELLOW MAGENTA
CYAN
MIXING the primary colours makes 3 SECONDARY COLOURS. What are they?

7. Filters - only let the colour pass that they are, all other colours are absorbed.
PRIMARY FILTERS
White
Red
White
Green
Red filter
Green filter
White
Blue
Blue filter

8. Secondary Filters Green Red Green Blue White White Yellow filter
Cyan filter
Red
White
Blue
Magenta filter

9. Exercise 4: Filters
Predict the colours that will emerge from the filter arrangements below. A. B. C.
White
White
White

10. Exercise 5: Filters
Predict the colours that will emerge from the filter arrangements below. A. B. C.
Green
Red
Blue

11. What colour would a red and blue shirt look in blue light?
Seeing Colour
A red shirt looks red in white light because it absorbs all the colours except for red. Red is reflected.
What colour would a red shirt look in blue light?
It would look black because a red shirt ONLY reflects red.
What colour would a red and blue shirt look in blue light?