If `c` is the velocity of light in vacuum, then find the time taken by the light to travel through a glass plane of thickness `t` and having refractive index `mu`.

Options

A. `(t/(muc))`
B. `tmuc`
C. `(mut)/c`
D. `(tc)/(mu)`

Explanation

(c) `mu=("Velocity of light in vacuum")/("Velocity of light in glass plate")=c/(c')`
or `c'=c/(mu)`
Time taken `=("distance")/("velocity")=t/((c/(mu)))=(muf)/c`