Introductory Optical Bench Set, 1 Each

The Introductory Optical Bench Set by United Scientific is an economical bench for introductory lens work, with a 74 cm extruded aluminum bench, three-position push-in riders that lock when an element is inserted, four 50 mm mounted lenses (three convex, one concave), an LED-illuminated "F" object powered by an AAA battery, and an opaque screen with scales. Teachers use it to explore image formation by lenses without cables on the bench.