Labels:text | screenshot | font | number OCR: FOCUS THE TWO FOCI OF AN ELLIPSE are two points within it whose positions are defined by the property that the combined length of the two lines drawn from the foci to any point on the ellipse is a constant. THE FOCUS OF A LIGHTBEAM IS the point at which rays converge to form an image after passing through a convex lens or being reflected by the surface of a concave mirror.
