Q. The focal length $(f)$ of a spherical (concave or convex) mirror of radius of curvature $R$ is
A) $\frac{R}{2}$
B) $R$
C) $\left( \frac{3}{2} \right)R$
D) $2R$
Explanation
(a) $f = \frac{R}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.