Question

A rectangular glass slab ABCD of refractive index is immersed in water of refractive index . A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence such that the ray comes out from the other surface CD is given by

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A

B

C

D

Hard
Solution
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Correct option is A)

For the ray to emerge from the face CD, it at first must undergo total internal reflection at face AD i-e, 
                  .........................(1)
Also from geometry,  .............(2)
Snell's law for face AB,   
Thus from (1) & (2),  
Thus  

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