Q. When a plane mirror is placed horizontally on a level ground at a distance of $60m$ from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of $90{^\circ}$ at the $eye$. The height of the tower will be
A) 30$m$
B) 60$m$
C) 90$m$
D) 120$m$
Explanation
(b) $\tan{45{^\circ}} = \frac{h}{60} \Rightarrow h = 60\ m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.