Question

Example
A rectangular glass wedge (prism) is immersed in water
as shown in figure E-a. For what value of angle a, will the
beam of light, which is normally incident on AB, reach AC
entirely as shown in figure E-b. Take the refractive index of
water as 43 and the refractive index of glass as 3/2.
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Answer 1

The answer would had been easy if you had showed the diagram too.