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A diverging beam of light from a point source 5 having divergence angle , 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  and the refractive index  then the divergence angle of the emergent beam is

a)

Zero

b)

c)

d)



Question ID - 152350 | SaraNextGen Top Answer

A diverging beam of light from a point source 5 having divergence angle , 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  and the refractive index  then the divergence angle of the emergent beam is

a)

Zero

b)

c)

d)

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Since rays after passing through the glass slab just suffer lateral displacement hence we have angle between the emergent rays as

127 votes


127