Question

how is the refractive ibdex of a medium related to the dpeed of light ​

Answer 1

If we think back to the definition of index of refraction, we know that it is defined by the ratio of the velocity of light in a vacuum and the velocity of light in some other medium.

n=cv

n is the index of refraction, c is the speed of light in a vacuum, and v is the speed of light in the new medium.

We can see that n and v are inversely proportional, meaning that the higher the n, the lower the velocity. As the light moved from air (n =1) to glass (n = 1.5), the n increased, and thus the velocity must decrease because the speed of light in a vacuum is constant.

Answer 2

Refractive index of a medium(n)= speed of lightin vacccum or air(c) /speed of light in given medium (v)

hence n=c/v

hope it helps you