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

The angle of elevation of an aeroplane as observed from a point 30 m a

1.	The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water-surface of a lake is 30Â° and the angle of depressionÂ of the image of the aeroplane in the water of the lake is 60Â°. 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
Answer» B. 45 m

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

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