[" If "(B)4amquad (C)-2am],[mquad " ord "y=mx+c" subtends a right angle at the vertex of the parabolay "^(2)=4a]

If the chord y=mx+c subtends a right angle at the vertex of the parabola y^(2)=4ax thenthe value of c is

If the chord y = mx +c subtends a right angle at the vertex of the parabola y^(2)=4ax then the value of c is

If a normal subtends a right angle at the vertex of a parabola y^(2)=4ax then its length is

If a normal subtends a right angle at the vertex of a parabola y^(2)=4ax then its length is

If the chord y = mx + c subtends a right angle at the vertex of the parabola y^2 = 4ax , thenthe value of c is

If the normal chord at t on y^(2)=4ax subtends a right angle at vertex then t^(2)=

Find the locus of the middle points of the chords of the parabola y^2=4a x which subtend a right angle at the vertex of the parabola.

Find the locus of the middle points of the chords of the parabola y^2=4a x which subtend a right angle at the vertex of the parabola.

Find the locus of the middle points of the chords of the parabola y^2=4a x which subtend a right angle at the vertex of the parabola.