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The angle of elevation of a cloud from a...

The angle of elevation of a cloud from a height h above the level of water in a lake is `alpha` and the angle of depressionof its image in the lake is `beta`. Find the height of the cloud above the surface of the lake:

A

`(h sin(beta-alpha))/sin(alpha+beta)`

B

`h sinalpha`

C

`(h sin(alpha+beta))/sin(beta-alpha)`

D

none of these

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The correct Answer is:
C
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