a projection apparatus includes an image - producing element and projection optics . the image - producing element produces at least one image , and the projection optics has free - form areas for magnifying and reflecting the image toward an viewer for observation . the projection optics includes at least a first mirror and a second mirror , the image is reflected by the first mirror and the second mirror in succession , no deflection mirror is disposed between the viewer and the second mirror , and the first mirror and the second mirror are in the form of a non - rotationally symmetrical system .