What is the refractive index?
1 Answer
Sep 20, 2016
It is a pure number that gives us the value of the ratio between the speed of light in vacuum and the speed of light inside a medium.
Explanation:
In passing from vacuum to a medium light slows down. So if we cal the speed of light in vacuum
It is a way to carachterize a phisical medium (say, water) with respect to the change in speed of light it produces so that you'll have different values for different materials: