question_answer

When a plane mirror is placed horizontally on a level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of \[{{90}^{o}}\] at the eye. The height of the tower will be

A) 30 m

B) 60 m            

C) 90 m

D) 120 m

Correct Answer: B

Solution :

[b] \[\tan {{45}^{o}}=\frac{h}{60}\Rightarrow \,\,h=60m\]