Study image formation with concave mirrors. The screen view shows the pattern of illumination on the screen, regardless of its location.
Study virtual image formation with convex (or plane) mirrors. The eye view shows what the eye "sees."

General palette with tools to draw single light rays and sprays of light rays, point sources, complex sources, screen, eye, blocker and mirror (concave, convex or plane).

Measurement palette to measure distances, angles and light intensity.

Graphics palette, including snapshot tool.