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PATIKIL 2" (50mm) Focal Length Double Convex Lens, 3 Pcs 30mm Diameter 5mm Height Glass Optically Polished Round Edges Lens for Physics Experiment, Clear bee Home security signs show thatPATIKIL 2" (50mm) Focal Length Double Convex Lens, 3 Pcs 30mm Diameter 5mm Height Glass Optically Polished Round Edges Lens for Physics Experiment, Clear The double convex lens is a type of lens that is thicker at the center than at the edges and is used to gather light. It can make telescopes, suitable for a variety of applications, including scientific experiments, photography, and optical instruments. Specification Color: Transparent Material: