The bending of light when it enters a medium where its speed is different.

The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane.For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.The above law is called Snell's law after the scientist Willebrod Snellius who first formulated it

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i want law
Law of refraction .............
Snell's law (also known as the Snell–Descartes law and thelaw of refraction) is a formula used to describe the relationship between the angles of incidence andrefraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.