Q. The focal length of a convex mirror is $20\ cm$ its radius of curvature will be
A) 10 $cm$
B) 20 $cm$
C) 30 $cm$
D) 40 $cm$
Explanation
(d) $f = \frac{R}{2} \Rightarrow R = 40cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.