Q. A concave mirror is used to focus the image of a flower on a nearby well $120\ cm$ from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be
A) 8 $cm$
B) 12 $cm$
C) 80 $cm$
D) 120 $cm$
Explanation
(a) Let distance $= u$. Now $\frac{v}{u} = 16$ and $v = u + 120$
$\therefore\frac{120 + u}{u} = 16 \Rightarrow 15u = 120 \Rightarrow u = 8\ cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.