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A light beam is traveling from Region I ...

A light beam is traveling from Region I to region IV (refer figure). The refractive indices 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^(-)((3)/(4))`

B

`sin^(-)((1)/(8))`

C

`sin^(-)((1)/(4))`

D

`sin^(-)((1)/(3))`

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