If normal at p to parabola y2=4ax meets parabola again at Q such that PQ subtends a right angle at the vertex of y2=4ax then p will be
It is useful to remember that fact that,If normal at
(at21,2at1) meet the parabola at (at22,2at2) then,
Here, Given slope of PO=2at1at21=2t1
Slope of QO=2at2at22=2t2
And (slope of PO)(slope of QO)=-1
∴ Only option c satisfies.