A diversing beam of light from a point source $S$ having divergence angle $ϕ$ , 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 $μ$ , then the devergence angle of the emergent beam is

ϕ

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zero

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{sin}^{- 1} (\frac{1}{μ})

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2 {sin}^{- 1} (\frac{1}{μ})

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Solution

The correct option is A $ϕ$
The incident and the emergent rays are parallel, because the glass slab is rectangular (incidence and refractive surfaces are parallel). Therefore the divergence angle of the emergent ray remains the same i.e $ϕ$ .

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A diversing beam of light from a point source S having divergence angle ϕ, 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 μ, then the devergence angle of the emergent beam is

The correct option is A ϕThe incident and the emergent rays are parallel, because the glass slab is rectangular (incidence and refractive surfaces are parallel). Therefore the divergence angle of the emergent ray remains the same i.e ϕ.

The correct option is A $ϕ$
The incident and the emergent rays are parallel, because the glass slab is rectangular (incidence and refractive surfaces are parallel). Therefore the divergence angle of the emergent ray remains the same i.e $ϕ$ .