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Q.

A diverging beam of light from a point source S having divergence angle α, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

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a

Zero

b

α

c

sin−11/n

d

2sin−11/n

answer is B.

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Detailed Solution

Since rays after passing through the glass slab just suffer lateral displacement hence we have angle between the emergent rays as α.

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