A light beam is travelling from region I to region IV (refer figure). The refractive index in region I,II,III and IV are `n_(0),(n_(0))/(2),(n_(0))/(6) and (n_(0))/(8)`, respectively. The angle of incidence `theta` for which the beam just misses entering region IV is A. `sin^(-1)((3)/(4))`B. `sin^(-1)((1)/(8))`C. `sin^(-1)((1)/(4))`D. `sin^(-1)((1)/(3))`

A light beam is travelling from region I to region IV (refer figure).

1.	A light beam is travelling from region I to region IV (refer figure). The refractive index in region I,II,III and IV are `n_(0),(n_(0))/(2),(n_(0))/(6) and (n_(0))/(8)`, respectively. The angle of incidence `theta` for which the beam just misses entering region IV is A. `sin^(-1)((3)/(4))`B. `sin^(-1)((1)/(8))`C. `sin^(-1)((1)/(4))`D. `sin^(-1)((1)/(3))`
Answer» Correct Answer - B

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