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 O. The height of the tower will be
A
30m
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B
60m
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C
90m
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D
120m
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Solution
The correct option is B60m
Let h be the height of the tower.
As tower and its image is subtending an angle of 90∘.
Therefore, θ in triangle AOB is θ=45∘ and Base OB=60m