Set of 6 lenses with outer diameter of 38mm. This lens set includes samples of double convex, double concave, plano concave, plano convex and concave convex lenses.

To focus light along a straight line. Useful for looking at full paths of rays on paper, such as pencils of light emerging from the slits of a comb illuminated by a small lamp. Made of optically true glass with polished faces and ground edges. Also known as square lens or ray box lens.

Made of polished glass with ground edges. Bi-convex lens: Magnifying or condensing lenses, with two outward curving symmetrical faces.

This lens set is comprised of the most important types of lenses. Optically true with ground glass edges. Includes one of each: double convex, plano-convex, double concave, plano-concave, concavo-convex and convexo-concave, arranged in a velvet lined case. Diameter 50 mm

Wooden and polished. Mounted on base with slot to hold lenses or mirrors. Can be used with meter scale to form simple optical bench.

Made of polished glass with ground edges. Bi-concave lens: Used for reducing the size or spreading out light, with two inward curving symmetrical faces.