Q. When a plane mirror is placed horizontally on a level ground at a distance of 60 metre from the foot of a tower. The top of the tower and its image in the mirror subtend at the eye an angle of $ {{90}^{o}} $ , the height of the tower is:
Rajasthan PMTRajasthan PMT 1995
Solution:
$ \tan 45=\frac{h}{60} $
$ 1=\frac{h}{60} $ $ \therefore $ $ h=60m $ Height of tower is 60 m.
