U4AOS1 Topic 17: Colour Dispersion

Colour dispersion is where white light spreads and splits into its different components.

When light goes through a medium and refraction occurs, the different colours that make white light will bend at different angles, separating them.

 

Red is always closest to the normal because it travels at a slower speed as it passes through the medium. Since it has a longer wavelength it gets slowed down less than purple/blue light.