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The length of latus rectum of the parabo...

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

A

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

B

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

C

`(2u^(2))/(g) Cos2alpha`

D

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

Text Solution

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The correct Answer is:
D
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