1. Visible Light

3. Wave Model of Light
A model is a way for scientists to explain what they see
The Wave Model of Light pictures light travelling as waves
Light = wave = transfers energy

4. Why do we see a rainbow? Light can bend = refract
How much light can bend depends on its wavelength

5. Why do we see a rainbow?
A beam of light contains all the colours of the rainbow
All of the colours have different wavelengths

6. Why do we see a rainbow? Which colour has the longest wavelength?
Which colour has the shortest wavelength?
Which colour has the highest frequency?
Which colour has the lowest frequency?

7. How do we see a rainbow? A prism is used to separate the colours
The different angles of the walls cause the bending of light

8. How do we see colours?
Reflection occurs when a light wave strikes an object and bounces off
Some colours are reflected (and seen) and other colours are absorbed
Eureka!

9. How do we see colours?
Only three colours are needed to produce all the colours of the rainbow!
Primary colours of light – Red, Blue, Green
Different from primary colours of paint
When combined together, produce the secondary colours of light – yellow, cyan and magenta

10. How do we see colours? Blue + Green = Cyan Green + Red = Yellow
Red + Blue = Magenta