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Double Convex and Concave Glass Lens Pair, 40mm Diameter, 200mm Focal Length Chemical_Zinc Metal labeled on a wall mountable backboard labeled on a wall mountable backboard with a 24 48 hour color change indicating the presence of coliform bacteria the convex concave duo letting students compare converging and diverging refraction side by side Pairs a 40mm double convex lens with a matched 40mm double concave lens at 200mm focal length
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