A light beam is travelling from Region I to Region IV. The refractive – InterviewSolution

1.	A light beam is travelling from Region I to Region IV. The refractive index in Regions I , II, III and IV are no,no2,no6 and no8 respectively. The angle of incidence θ for which the beam just could not enter region IV is :-
Answer» A light beam is travelling from Region $I$ to Region $IV$ . The refractive index in Regions $I$ , $II$ , $III$ and $IV$ are $n_{o}, \frac{n_{o}}{2}, \frac{n_{o}}{6}$ and $\frac{n_{o}}{8}$ respectively. The angle of incidence $θ$ for which the beam just could not enter region $IV$ is :-

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