Q. A short linear object of a length $b$ lies along the axis of a concave mirror of focal length$\ f$ at a distance $u$ from the pole of the mirror. The size of the image is equal to
A) $b\left( \frac{u - f}{f} \right)^{1/2}$
B) $b\left( \frac{f}{u - f} \right)^{1/2}$
C) $b\ \left( \frac{u - f}{f} \right)$
D) $b\ \left( \frac{f}{f - u} \right)$
Explanation
(d) Length of image =$\left( \frac{f}{f - u} \right)b$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.