Photo 1 of ULTECHNOVO Double Convex Glass Lens, Optically Worked Glass Lens Optical Glass, Spherical, 30mm Diameter, 50mm Focal Length for Labs Physics Classrooms

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Photo 1 of ULTECHNOVO Double Convex Glass Lens, Optically Worked Glass Lens Optical Glass, Spherical, 30mm Diameter, 50mm Focal Length for Labs Physics ClassroomsPhoto 2 of ULTECHNOVO Double Convex Glass Lens, Optically Worked Glass Lens Optical Glass, Spherical, 30mm Diameter, 50mm Focal Length for Labs Physics Classrooms