A light beam is traveling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are \n_0 ,\n_0/2 ,\n_0/6 and \n_0/8 , respectively. The angle of incidence θ for which the beam just misses entering Region IV in figure

Correct Answer is : sin−1(18)

NEET 2021 Model Test Paper 7

Question : 42 of 180

Marks: +1, -0

A light beam is traveling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are n0,

and

, respectively. The angle of incidence θ for which the beam just misses entering Region IV in figure

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