A light ray is incident normally on a glass slab of thickness t and refractive index mu as shown in the figure. Then find time taken by the light ray to travel through the slab.

A light ray is incident normally on a glass slab of thickness t and re

1.	A light ray is incident normally on a glass slab of thickness t and refractive index mu as shown in the figure. Then find time taken by the light ray to travel through the slab.
Answer» SOLUTION : From the figure distance TRAVELLED by the LIGHT ray through the SLAB is t. Velocity of light in glass `=(distance travell ed) / (TIME)` `c/mu=t/ (time) , time = (mu t)/c`