" Which of the following line,is a normal to the parabola "y^(2)=16x?

Locus of the point of intersection of the normals to the parabola y^(2)=16x which are at right angles is

The line y=2x+k is a normal to the parabola y^(2)=4x then k=

The locus of the midpoints of the portion of the normal to the parabola y^(2)=16x intercepted between the curve and the axis is another parabola whose latus rectum is ___________ .

The locus of the midpoints of the portion of the normal to the parabola y^(2)=16x intercepted between the curve and the axis is another parabola whose latus rectum is ___________ .

The locus of the midpoints of the portion of the normal to the parabola y^(2)=16x intercepted between the curve and the axis is another parabola whose latus rectum is ___________ .

The line y=2 x+k is a normal to the parabola y^(2)=4 x, then k=

The value of thetain(-pi/2, pi/2) for which the line y=x" cos "theta+4" cos" ^(3)" "theta-14" cos "theta-1 is a normal to the parabola y^(2)=16x, is