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Q.

A beam of light composed of red and green rays 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 rays emerge from :     

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a

Two points propagating in two different non parallel directions.

b

Two points propagating in parallel directions.

c

One point propagating in two different directions.

d

One point propagating in the same  direction.

answer is B.

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Detailed Solution

For light of different colour the refractive index is different. The emergent ray will be parallel to incident ray.
The higher the retractive index the more will be shift in emergent ray. Hence we will get two parallel emergent rays.

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