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The angle of elevation of an aeroplane a...

The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water-sur- face of a 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

75 m

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