Q.
A fish is a little away below the surface of a lake. If the critical angle is $49{^\circ}\ $, then the fish could see things above water surface within an angular range of $\theta{^\circ}\ $where
A) $\theta = 49{^\circ}$
B) $\theta = 98{^\circ}$
C) $\theta = 24\frac{1}{4}{^\circ}$
D) $\theta = 90{^\circ}$
Explanation
(b) The angular range is clearly twice the critical angle
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.