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 glass plate = `(c )/(n)`
Time = `("Distance")/("Speed") = (tn)/(c )`.