Two mutually perpendicular tangents of t...

Two mutually perpendicular tangents of the parabola `y^(2)=4ax` meet the axis at `P_(1)andP_(2)`. If S is the focus of the parabola, Then `(1)/(SP_(1))+(1)/(SP_(2))` is equal to

A

(a) `1/(4a)`

B

(b) `1/a`

C

(c) `2/a`

D

(d) `4/a`

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The correct Answer is:

B

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