Ray optics demonstration apparatus consisting of a white semi-circular board fitted with a lamp housing on a rotating arm and clips for condenser lens, aperture plate, and paper, with a drawer containing (1) aperture plate with single narrow slit, (2) aperture plate with three slits, (3) aperture plate with single broad slit, (4) clamp for optical components, (5) convex cylindrical lens, (6) concave cylindrical lens, (7) plane mirror, ( 8) mirror holder, and (9) wooden support block