Question

define absolute refractive index and relative refractive index​

Answer 1

Absolute refractive index of a medium is defined as the ratio of the velocity of light in a vacuum to the velocity of light in the medium.

The relative index of refraction is a ratio of the speed of light in one medium to the speed of light in another medium

Answer 2

Answer:

Bending of light at the boundary of two medium is called refraction.

The light bending ability of that particular medium is called refractive index.

Refractive index is defined as ratio of sine of angle of incidence to sine of angle of refraction.

It is denoted by n or μ.

Thus, refractive index is given by,

(method is given upward)( in pic )

Absolute refractive index: When the light is going from vacuum to another medium, then the value of refractive index is called the absolute refractive index.

Relative refractive index: When the light goes from one medium ( other than vacuum or air) to another medium then that refractive index is called relative refractive index.

Note: Refractive index of vacuum or air is 1.