American Educational Unmounted Double Convex Lenses with Ground Edges, 50mm Diameter, 20cm Focal Length (Bundle of 5);
American Educational Unmounted Double Convex Lenses with Ground Edges, 50mm Diameter, 20cm Focal Length (Bundle of 5)

Superior-quality lenses are great for teaching a variety of optical principles

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Superior-quality lenses are great for teaching a variety of optical principles

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