Bi-Convex lens with 38-mm diameter, made of polished glass with ground edges. Bi-convex lenses are also known as magnifying or condensing lenses, have two outward curving symmetrical faces. Sold individually. The price is for each lens.
38-mm biconvex lenses are available in different focal lengths including 50 mm, 100 mm, 150 mm, 200 mm, 300 mm and 500 mm.