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From the top of a light -house at a heig...

From the top of a light -house at a height 20 metres above sea -level,the angle of depression of a ship is `30^(@)`.The distance of the ship from the foot of the light house is

A

20 m

B

`20 sqrt(3)` m

C

`30 m`

D

`30 sqrt(3)` m

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