A monochromatic light passes through a glass slab `(mu = (3)/(2))` of thickness 90 cm in time `t_(1)`. If it takes a time `t_(2)` to travel the same distance through water `(mu = (4)/(3))`. The value of `(t_(1) - t_(2))` is

Options

A. `5xx10^(-11)` sec
B. `5xx10^(-8)`sec
C. `2.5xx110^(-10)` sec
D. `5xx10^(-10)` sec

Answer

A

Explanation

`t_(1)-t_(2)=(mu_(1)-mu_(2))x/c,20.mualpha1/lambda` and `t=nlambda`