Geometrical OpticsHard
Question
A light ray is incident perpendicular to one face of a 90o prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45o, we conclude that the refractive index n
Options
A.n < 
B.n > √2
C.
D.n < √2
Solution
Angle of incidence i > C for total internal reflection.
Here i = 45o inside the medium.
∴ 45o > sin-1(1/n)
⇒ n > √2
Here i = 45o inside the medium.
∴ 45o > sin-1(1/n)
⇒ n > √2
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