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EISCO Double Convex Lens, 100mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens Ground Edges, Polished Great for Physics Classrooms- Eisco Labs sold2025 50% dry hairEISCO Double Convex Lens, 100mm Focal Length, 1. 5" (38mm) 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 1. 5" (38mm) in diameter 100MM FOCAL LENGTH Converging lens with a 100mm focal length OPTICALLY WORKED GLASS Made of high quality, optically worked glass. Highly polished with ground edges GREAT