Here a and h are distances such that x=a when z=h, and the length of the semi latus rectum is l=a2/(2h). The section in the plane y=0 is the "nose down" parabola \(x^...Here a and h are distances such that x=a when z=h, and the length of the semi latus rectum is l=a2/(2h). The section in the plane y=0 is the "nose down" parabola x2=a2z/h extending above the xy-plane. The section in the plane x=0 is the "nose up" parabola y2=−b2z/h extending below the xy-plane.
