Question

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 4/3 and the refractive index of glass as 3/2.
C С
fig E-a​

Answer 1

Answer:

For total internal reflection to occur on the face ad,

θ>θ

c

Thereore,

sinθ>sinθ

c

sinθ

c

=

2

3

3

4

Thus, sinθ

c

>

9

8