Q. Where should a person stand straight from the pole of a convex mirror of focal length 2.0 m on its axis so that the image formed become half of his original height?
A) -2.60m
B) -4.0m
C) -0.5m
D) -2.0m
Explanation
(d) $m = \frac{f}{f - u}$
$\frac{1}{2} = \frac{200}{200 - u}$
$200\ –\ u\ = \ 400$
$u\ = \ - 200\ cm$
$u\ = \ - 2\ m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.