Neutralizing Lens Set, 38 mm Diameter, 1 Each

The Neutralizing Lens Set by United Scientific is a pair of 38 mm diameter lenses, one convex and one concave, both with a 150 mm focal length. Placed together, the matched lenses show how a diverging lens cancels a converging lens of equal strength. Physics teachers use the set to introduce lens power, lens combinations and focal length measurement on an optical bench.