or lenses that are flat on one side. Biconvex lenses can be constructed by gluing two planoconvex lenses back to back, which is done with an acrylic glue, in this case Acrifix adhesive.

F3.5-22 lens with a Cooke Triplet design, which was patented in 1893. It is made up of three air-spaced elements – two biconvex lenses surrounding a biconcave lens – which helps reduce ...