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5. A diverging beam of light from a poin...

5. A diverging beam of light from a point source Shaving 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 I and the refractive index n, then the divergence angle of the emergent beam is (a) Zero (c) sin (1/n) (b) a (d) 2 sin (m)

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