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The angle of elevation of a cloud from ...

The angle of elevation of a cloud from a point 200 m above a lake is `30^@` and the angle of depression of its reflection in the lake is `45^@`. Find the height of the cloud from the lake.

A

`(2h)/(tan alpha - tan beta)`

B

`(2h sec alpha)/(tan alpha - tan beta)`

C

`(2h sec alpha)/(tan beta - tan alpha)`

D

none of these.

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UNITED BOOK HOUSE-Application of Trigonnometric Ratios : Heights of Distance-Exercise
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