Double Concave Lens Even Edges and Thickness - Ideal for Spinning Top - 75 mm Dia 20 cm FL

American Educational Unmounted Double Concave Lenses with Ground Edges, 38mm Diameter, 20cm Focal Length (Bundle of 5)

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Unmounted with Ground Edges

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Unmounted with Ground Edges

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Double Concave Lens Even Edges and Thickness - Ideal for Spinning Top - 75 mm Dia 20 cm FL