Forms of lenses Lenses are labeled with the curvature of the two optical surfaces. A lens is biconvex (or double convex, or perhaps convex) if both surfaces are convex. If each surfaces contain the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave https://napkinsupplier82715.fireblogz.com/54833173/an-unbiased-view-of-렌즈