The angle of reflexion is equal to the angle of incidence for all wavelengths. The refraction angle depends on the indices n1 and n2 of the two media. This is Snell's law, also known as Descarte’s Law, or The Law of Refraction.
When light passes from one medium to another, some of this light is reflected while another part penetrates into the medium with a change in its direction.
These two phenomena are called the reflection and refraction of light.
Refraction helps explain why a partially immersed object in a liquid seems broken at the surface. This refraction phenomenon also explains why a fish's apparent position is distorted from its real position..
Click and drag the fish.
Drag the 'slider' to change the index.