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Double Convex Lens, 150mm Focal Length, 2" (50mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs hidden hospital-quality woven cotton gauze squaresDouble Convex Lens, 150mm Focal Length, 2" (50mm) Diameter Spherical, Optically Worked Glass Lens Ground Edges, Polished Great for Physics Classrooms Eisco Labs Product Features DOUBLE CONVEX Highly polished, double convex lens SPHERICAL Lens measures 2" (50mm) in diameter 150MM FOCAL LENGTH Converging lens with a 150mm focal length OPTICALLY WORKED GLASS Made of high quality, optically worked glass. Highly polished with ground edges GREAT FOR PHYSICS