Optics Question 87

Question: A diverging beam of light from a point source S having divergence angle a, 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

[IIT-JEE (Screening) 2000]

Options:

A) Zero

B) a

C) $ {{\sin }^{-1}}(1/n) $

D) $ 2{{\sin }^{-1}}(1/n) $

Show Answer

Answer:

Correct Answer: B

Solution:

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



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