an applet for converging lenses
an applet for diverging lenses
an applet for convex mirrors
an applet for converging lenses that permits you to move object, change lens diameter and thickness, and change lens index of refraction
an applet for both kinds of lens; permits rays to be drawn individually
an applet for mirrors; permits rays to be drawn individually
an applet for both kinds of lenses and mirrors with numerical input/output as well as figures