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If normal at point P on the parabola y^2...

If normal at point `P` on the parabola `y^2=4a x ,(a >0),` meets it again at `Q` in such a way that `O Q` is of minimum length, where `O` is the vertex of parabola, then ` O P Q` is (a)a right angled triangle (b)an obtuse angled triangle (c)an acute angle triangle (d)none of these

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