Refraction of light is the process in which the direction and speeds of light change when moving from one medium to another.Laws of Refraction of Light:The normal, the incident ray and the refracted ray all lie in the same plane.The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for the light of a given colour and for the given pair of media. This law is known as Snell's law.