Optics Question 524

Question: 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

[CPMT 1984]

Options:

A) $ 30m $

B) $ 60m $

C) $ 90m $

D) $ 120m $

Show Answer

Answer:

Correct Answer: B

Solution:

$ \tan 45{}^\circ =\frac{h}{60} $

$ \Rightarrow h=60m $



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