The length of the latus rectum of the pa...

The length of the latus rectum of the parabola whose focus is `(u^2/(2g) sin2alpha, -u^2/(2g) cos2alpha)` and directrix is `y=u^2/(2g)`,is

A

`(u ^(2))/( g ) cos ^(2) alpha `

B

`(u ^(2))/( g ) cos 2 alpha `

C

`(2 u ^(2))/( g ) cos ^(2) 2 alpha`

D

`(2 u ^(2))/( g ) cos ^(2) alpha `

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The correct Answer is:

D

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