A rectangular glass slab ABCD of refract...

A rectangular glass slab ABCD of refractive index `n_(1)` is immerged in water of refractive index `n_(2) (n_(1) gt n_(2))` . A ray of light is incident at the surface AB of the slab as shown . The maximum value of the angle of incidence `alpha_("max")` , such that the ray comes out only from the other surface CD , is given by :-

`sin^(-1)[(n_(1))/(n_(2))cos(sin^(-1).(n_(2))/(n_(1)))]`

`sin^(-1)[n_(1)cos(sin^(-1).(1)/(n_(2)))]`

`sin^(-1)((n_(1))/(n_(2)))`

`sin^(-1)((n_(2))/(n_(1)))`

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