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:
- (d) For total internal reflection when $i=i_c$, then
refracted ray grazes with the surface. That means the angle of refraction $r=90^{\circ}$.
BETA
