Varieties of lenses Lenses are categorized from the curvature of the two optical surfaces. A lens is biconvex (or double convex, or simply convex) if the two surfaces are convex. If both equally surfaces contain the identical radius of curvature, the lens is equiconvex. A lens with two concave surfaces https://napkin29372.jaiblogs.com/50284263/examine-this-report-on-렌즈미-브라운-렌즈