Q. A normally incident ray reflected at an angle of $90{^\circ}$. The value of critical angle is
A) $45{^\circ}$
B) $90{^\circ}$
C) $65{^\circ}$
D) $43.2{^\circ}$
Explanation
(b) Critical angle $C$ is equal to incident angle if ray reflected normally $\therefore C = 90{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.