Joint Entrance Examination/2000 Screening/Q032 Divergent beam passsing from a glass slab

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Original Question by Dharav talk

Here's the question...

A diverging beam of light from a point source S having divrgence 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 its refractive index is n, then the divergence angle of the emergent beam is

(A) Zero (B) α (C) sin-l(1/n) (D) 2sin-l(1/n) Posted by Dharav talk 05:21, 18 August 2009 (UTC)



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