Question

12. (a) Define refractive index and express it mathematically​

Answer 1

Explanation:

Relative refractive index can be defined as the ratio between the velocities of light V1 and V2 in a given medium. The relative refractive index is generally denoted as n21. Mathematically deriving it N21= V1 / V2. Absolute refractive index of a medium is the refractive index with respect to its volume.

Answer 2

Answer:

The ratio of the speed of light in vacuum to the speed of light in the medium is called refractive index of a material.

It signifies the measure of the speed of light when its changes the medium.

Its formula is given by :

n=c/v

c is speed of light in vacuum

v is speed of light in medium