The angle of elevation of an aeroplane as observed from a...

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The angle of elevation of an aeroplane as observed from a point 30 m above the transport water-surface of lake is 30° and the angle of depression of the image of the aeroplane in the water of the lake is 60°. The height of the aeroplane from the water-surface of the lake is

A. 60 m

B. 45 m

C. 50 m

D. 55 m

Answer: Option A

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