What is refraction of light? Draw the diagram of refraction of light in glass slab. Write the laws of refraction.

Refraction is a phenomenon of bending of light due to change in optical density.

Laws of Reflection :

(1) incident ray, refracted may and the normal to the surface at the point of incidence, all lie in same plane.

(2) Snell's law

${\mu }_{1}sini={\mu }_{2}sinr$.