Question

Light travels through a glass plate of thickness t, having refractive index `mu`. If c is the velocity of light in vaccum, then the time taken by light to travel this thicness of glass is
A. `x mu v`
B. `x v //mu`
C. `x// mu v`
D. `mu x //v`

Answer 1

Correct Answer - D
`mu_(m) = mu, v_(a) = v, d_(m) = x, t_(m) = ?`
`t_(m) = (d_(m))/(v_(m)) = (d_(m))/((v_(a))/(mu_(m))) = (d_(m).mu_(m))/(v_(a))`
`:. t_(m) = (x mu)/(v)`