The primary light colours are red blue and green. They can be mixed, as follows, to form secondary light colours:
- red + green = yellow
- red + blue = magenta
- blue + green = cyan
By using a prism, white light can be separated into all the different (dispersion) colours that make up white light. These are (starting with long wavelength):
- red, orange, yellow, green, blue, indigo, violet
- The angle of incident always equals the angle of reflection.
- These are measured against the normal which is an imaginary straight line at a right angle to the mirror.
- Refraction is the process that occurs when light travels from one material to another, it is either speed up or slowed down.
- This has an effect on the light and bends it.
- The denser the material, the slower the speed of light.