Question

For an angle of incidence of 45° at the top surface of a glass slab as shown in figure, what is
4
the maximum refractive index of glass for total internal reflection? For water n =
4/3
Water
45° Glass
4
(1)
(2)
4√2
3
312
3
312
4
(3)
(4)
413
5​

Answer 1

Answer.

2) 4 root 2/ 3 is the right answer.