Question

what is refractive index???​

Answer 1

$\bf\large\underline\blue{Answer:-}$

In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how fast light travels through the material. It is defined as. where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

Answer 2

Answer:

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

Explanation:

In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.