Question

what is the exact meaning of and refractive index what we get is the answer divided when speed of light is divided in one medium to another medium what is what is meant by that answer​

Answer 1

Answer:

Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. ... Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.

Answer 2

Explanation:

see the explanation here

it's again n=c/v which is absolute refractive index, one more is there which is called relative refractive index where different mediums than air is used so

n =V1/V2