Geometrical OpticsEasy
Question
A diverging beam of light from a source S having divergence angle fall 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 refrective index is n, then the divergence angle of the emrgent beam is
Options
A.zero
B.α
C.sin-1 (1 / n)
D.2 sin-1(1 / n)
Solution
Divergence angle will be 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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