First 131 words of the document:
Refraction occurs when light changes speed as it travels from one medium to another. This is
because the speed of a wave is determined by the medium through which it is passing.
For example, it can happen when light passes from water to air or from glass to water.
In the refraction of light, the angle of refraction is
always bigger than the angle of incidence.
1. At the angle of incidence the wave slows
down and bends TOWARDS the normal due to
entering a MORE DENSE medium
2. The wave speeds up and bends AWAY
from the normal due to entering a LESS DENSE
If the light ray enters ALONG the normal, it does not bend.