Refraction
Refraction is the bending of a wave when it enters a medium with different density; the result is change in speed.
The refraction of light is from a fast medium to a low medium which bends the light ray.
So how does Refraction Really Happen?
Refraction happens when light travels into a substance with a different refractive index which is a measurement of the bending of a ray of light when travelling from one medium to another. The change of direction is caused by the change of speed. When light goes into water it slows down, causing it to travel at a different angle or direction.
Refraction happens when light travels into a substance with a different refractive index which is a measurement of the bending of a ray of light when travelling from one medium to another. The change of direction is caused by the change of speed. When light goes into water it slows down, causing it to travel at a different angle or direction.
Here is a video to show how refraction works by Doodle Science