Question

How is the refractive index of a medium related
to the speed of light in it and in vacuum or air?​

Answer 1

Answer:

Let v1 be the speed of light inmedium 1 and v2 be the speed of light in medium 2. The refractive index of medium 2 with respect tomedium 1 is given by the ratio of the speed of light in medium 1 and the speed of light in medium 2. This is usually represented by the symbol n21

Answer 2

Explanation:

$\mathtt{\blue{The\: refractive\: index \:of \:a \:medium\: (n) \:is}} \\ \mathtt{\blue{\:equal \:to \:the \:speed \:of\: light\: (c) \:divided\:}} \\ \mathtt{\blue{ by \:the \:velocity \:of\: light \:through}} \\ \mathtt{\blue{the \:medium \:(v).}}$