1. State the laws of refraction of light. If the speed of light in vacuum is 3?10^8 m/s. Find the absolute refractive index if a medium in which light travels with a speed of 1.4?10^8 m/s.

The law of refraction states that when the ray of light travels from the rarer to denser medium the the ray of light bends toward the normal and if it is moving from denser to rarer medium the light bends away from the normal.

We can apply the snell's law at the interface of two medium to find either the angles or refractive index.

Refractive index = 1.4/3
= 7/15