Medium
$A$ 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 is $n$,then the divergence angle of the emergent beam is
- A$Zero$
- B$\alpha$
- C${\sin ^{ - 1}}(1/n)$
- D$2\,{\sin ^{ - 1}}(1/n)$
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