A light beam is travelling from Region I to IV (Refer Figure). The refractive index in 4 Regions I, II, III and IV are n0, 2/n0 , 6/n0 and 8/n0 , respectively. The angle of incidence θ for which the beam just misses entering Region IV is 2/n0 6/n0 and 8/n0 A light beam is [...]