this disclosure describes a method and apparatus for a visual display system in a vehicle simulator to compensate for distortion and to maximize illumination in a projected image substantially at the same time . where a spherical mirror is interposed between a curved rear - projection screen and a viewing position , certain distortions are developed which detract from realism . such distortions are compensated for by reflecting the image off a curve folding mirror positioned so that its major axis is substantially perpendicular to the major axis of the curved rear - projection screen . in accordance with the invention , when such compensation is achieved , the illumination of the projected image will be at substantially its brightest .