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 directions

Answer

B

Explanation

In any medium other than air or vacuum, the velocities of different colours are different. Therefore, both red and green colours are refracted at different angles of refraction. Hence, after emerging from glass slab through opposite parallel face, they appear at two different points and move in the two different parallel directions.
Aliter`:` Angle of refraction will be different, due to which red and green emerge from different points and will be parallel.