Q. 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°
Explanation
[Solution] At the critical angle the refracted ray grazes the surface, so the angle of refraction is 90°. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.