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

A diverging beam of light from a point source S having divergence angle `alpha`, falls symmetrically on a glass slab as shown in the figure. 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

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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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