y = x² + 6 - moves the parabola 6 places up the y axis y = x² – 7 - moves the parabola 7 places down the y axis In the video, the 2D curve of the Lovell Telescope dish is a parabola.

A parabolic antenna brings radio waves from a particular direction in space (along the axis of the parabola) to a focus as in Figure 1. The radio waves from the direction along the axis arrive at the ...