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When a plane mirror is placed horizontally on level ground at a distance of 60m from the foot of tower, the top of the tower and its image in the mirror subtend an angle of $90 °$ at the eye. The height of the lower is

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60 m

90 m

120 m

30 m

answer is B.

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Detailed Solution

Given in $Δ ABC$ from the diagram

$\tan 45 ° = \frac{h}{60}$

$h = 60 m$

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