NEET Physics Ray Optics and Optical Instruments Questions Solved

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


(a) Zero                                       (b) α

(c) sin-11/n                           (d) 2sin-1(1/n)

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