Light is refracted when it enters ... all angles are measured from the normal – a line at 90° to the refracting surface. It is refraction that makes some objects appear to bend when they ...

The dotted line is the normal (perpendicular ... This explains why a prism can disperse white light into different colours. The change in refraction is quite small and is only significant for ...

Read more: Refraction of Light Question 1 ... to a medium where it travels slower (water), it bends towards the normal line (an imaginary line perpendicular to the surface at the point of incidence).