Q. The critical angle for diamond (refractive index = 2) is
A) About $20{^\circ}$
B) 60${^\circ}$
C) 45${^\circ}$
D) 30${^\circ}$
Explanation
(d) $\mu = \frac{1}{\sin C} \Rightarrow C = \sin^{- 1}\left( \frac{1}{2} \right) = 30{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.