Question

what is refractive index​

Answer 1

Answer:

the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

Answer 2

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.