Question

Select One Correct Option from the following: A diverging beam of light from a 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 is
(A) zero
(B) $\alpha$
(C) $\sin^{-1} (1/n)$
(D) $\2sin^{-1} (1/n)$.

Answer 1

✔️ (A) zero

(B) $\alpha$

(C) $\sin^{-1} (1/n)$

(D) $\2sin^{-1} (1/n)$.