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  4. 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 its refractive index is n, then the divergence angle of the emergent beam is

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Q. A diverging beam of light from a point source S having divergence 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 its refractive index is n, then the divergence angle of the emergent beam isPhysics Question Image

IIT JEEIIT JEE 2000

Solution:

Divergence angle will remain unchanged because in case of a
glass slab every emergent ray is parallel to the incident ray.
However, the rays are displaced slightly towards outer side.
(In the figure OA \\BC and OD || EF)

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