A normal chord of the parabola `y^2=4ax` subtends a right angle at the vertex if its slope is

A normal chord of the parabola y^2=4ax subtends a right angle at the vertex, find the slope of chord.

The normal chord of the parabola y^(2)=4ax subtends a right angle at the vertex.Then the length of chord is

If a normal chord of a parabola y^(2) = 4ax subtends a right angle at the origin, then the slope of that normal chord is

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

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