Ray Optics And Optical Instruments Ques 75

75. In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

[2019]

(a) $180^{\circ}$

(b) $0^{\circ}$

(c) equal to angle of incidence

(d) $90^{\circ}$

Show Answer

Answer:

Correct Answer: 75.(d)

Solution:

  1. (d) For total internal reflection when $i=i_c$, then

refracted ray grazes with the surface. That means the angle of refraction $r=90^{\circ}$.

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