Light travels through a glass plate of thickness t and having refractive index n . If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

Options

A. `(t)/(nc)`
B. `tnc`
C. `(nt)/(c)`
D. `(tc)/(n)`

Answer

C

Explanation

Speed of light in medium `v=c//n`
Time to travel a distance, `t_0=t/v=(t)/(c//n)=(nt)/(c)`