Question

calculate the ri of the material of a glass slab. given that the speed of light in glass slab is 2×10^8m/s and in air is 3×10^8m/s. ​

Answer 1

Explanation :

Reflective index of air is 1 let's say

Speed of light in air x Ri in air = Speed of light in glass slab x Ri in glass slab

3x10^8m/s x 1 =2x10^8m/s x Ri g

Therefore,

Ri g = 3x10^8m/s / 2x10^8m/s

       = 1.5

Answer :

So the reflective index of glass would be 1.5