Question

Why bending of light ray takes place during refraction

Answer 1

During refraction light enters from one medium to another bending of rays takes place as the speed of the light and the wavelength changes

Answer 2

When light rays travel from a rarer medium to a denser medium or vice versa then the light rays tend to travel in a straight line but due to a seperation of medium the incident light rays bend towards the normal or towards the surface of teo media