NEET 2004 Physics question

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

(1)Two points propagating in two different parallel directionsCorrect
(2)One point propagating in two different directions through slab
(3)One point propagating in the same direction through slab
(4)Two points propagating in two different non parallel directions

Answer: (1)

Solution

At the first face the two colours are refracted by different angles (the refractive index of glass is different for red and green), so they follow different paths inside the slab and reach the opposite face at two different points. At the parallel second face each ray is refracted back to the angle of

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Question ID VK-089345