Question

what is the cause of refraction of light​

Answer 1

Answer:

Refractiona of light takes place when it travels from one medium to another because the speed of light is different in the two media.

Answer 2

Answer:

refraction of light takes place at junction of 2 media having different refractive indices. The proposed cause of refraction is change in velocity of light.

Scientists propose that on changing medium, there is change in velocity of light and as a result , light( being an electromagnetic wave) always has a tendency to cover the medium in least distance. Hence they undergo deviation or change in path.