A double-convex lens is compose of two convex surfaces, has a positive focal length. Normally Bi-Convex lenses are most suitable where the object and image are on opposite sides of the lens, and are ...

Biconvex Lenses at Shanghai Optics At Shanghai Optics we produce biconvex or double convex lenses with K9 borosilicate crown glass, BK7 Schott glass, quartz, sapphire, fused silica, CaF2, ZnSe, and ...

No. 1 is a double convex lens, or two convex surfaces on the ono glass; No. 2 is a plano-convex lens, having one side flat and the other curved outwards; those magnify by increasing the angle of ...