Optical Bench Set

Portable optical bench is a convenient self-contained collection of the optical pieces needed to study basic lens properties and their applications.
Set contains an illuminated "F" light source powered by 2 AAA batteries (not included), eliminating the need for pesky power supplies. Set also includes a 72-cm-long aluminum base marked for easy distance measurements; four 50-mm-diam lenses, with focal lengths of +100 mm, +150 mm, +200 mm, and -150 mm; an opaque screen; 6 plastic riders that slide on the base; and an experiment guide.
Experiments in the guide include the focal length of a convex lens, a virtual image of a convex lens, the magnification of a real image formed by a convex lens, the focal length of a concave lens, and more.