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A rectangular slab ABCD, of refractive i...

A rectangular slab ABCD, of refractive index `n_1` , is immersed in water of refractive index `n_2(n_1 lt n_2)`. A ray of light is incident at the surface AB of the slab as shown in Fig. Find the maximum value of angle of incidence `alpha_(max)`, such that the ray comes out only from the other surface CD.

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
A
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