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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)`

1 Answer

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Correct Answer - B
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`i=alpha/2`
Divergent angle of emergent beam
`=2i=alpha`

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