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A diverging beam of light from a point s...


A diverging beam of light from a point source S having devergence 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

A

zero

B

`alpha`

C

`sin^-1((1)/(n))`

D

`2sin^-1((1)/(n))`

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The correct Answer is:
B
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