Question

Select One Correct Option from the following: A light beam is traveling from Region I to Region IV (see figure). The refractive index in Region I, II, III and IV are $n_{0}$, $\frac{n_{0} }{2}$, $\frac{n_{0} }{6}$ and $\frac{n_{0} }{8}$, respectively. The angle of incidence $\theta$ for which the beam just misses entering region IV is
(A) $\sin^{-1} (\frac{3}{4} )$
(B) $\sin^{-1} (\frac{1}{8} )$
(C) $\sin^{-1} (\frac{1}{4} )$
(D) $\sin^{-1} (\frac{1}{3} )$.

Answer 1

a option is correct.
mark brainliest if you like

Answer 2

️(A) $\sin^{-1} (\frac{3}{4} )$

(B) $\sin^{-1} (\frac{1}{8} )$

(C) $\sin^{-1} (\frac{1}{4} )$

(D) $\sin^{-1} (\frac{1}{3} )$.