A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green ray emerge form

Options

A. two points propagating in two different non-parallel directions
B. two points propagating in two different parallel directions
C. one point propagating in two different directions
D. one point propagating in the same direction.

Answer

b

Explanation

We kknow that in any medium except vacuum or air the velocities of different colours are different.Therefore, both red and green colours are refracted at different angles of refraction so, after emerging from glass slab through opposite paralle faces, they apperar at two different points and move in two diffeent parallel direction.