Question

define refractive index.​

Answer 1

Answer:

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

Explanation:

Mark me as a brainliest

Good afternoon bye...........

Answer 2

$\huge\boxed{\fcolorbox{white}{pink}{AnsweR}}$

Ratio of the speed of light in vacuum to a definite medium is known as Refractive index