Double ordinate A B of the parabola y^2=...

Double ordinate `A B` of the parabola `y^2=4a x` subtends an angle `pi/2` at the focus of the parabola. Then the tangents drawn to the parabola at `Aa n dB` will intersect at `(-4a ,0)` (b) `(-2a ,0)` `(-3a ,0)` (d) none of these

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Double ordinate `A B` of the parabola `y^2=4a x` subtends an angle `pi/2` at the focus of the parabola. Then the tangents drawn to the parabola at `Aa n dB` will intersect at `(-4a ,0)` (b) `(-2a ,0)` `(-3a ,0)` (d) none of these

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