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If P S P^(prime) is a focal chord of the...

If `P S P^(prime)` is a focal chord of the parabola `y^(2)=4 a x` and `S L` is its semi latus rectum then `S P, S L, S P^(prime)` are in

A

`a`

B

`2 a`

C

`3 a`

D

`4 a`

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The correct Answer is:
B
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