25. 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 ?
25. 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 ?
(a) 180°
(b) 0°
(c) equal to angle of incidence
(d) 90°
Answer : (d) 90°
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