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

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

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

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