A diverging beam of light from a point source S having divergence… - Vidyadip

Question

A diverging beam of light from a point source $S $ having divergence angle $\alpha$, 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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Answer

(b) Since rays after passing through the glass slab just suffer lateral displacement hence we have angle between the emergent rays as $\alpha$

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