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° at the eye. The height of the tower will be

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30 m

60 m

90 m

120 m

answer is B.

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Detailed Solution

tan45∘=h60⇒h=60m

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