American Educational Products Double-Convex Lens 50 MM D X 20 CM FL, Set of 25 -
$59.99
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American Educational Set of 25 Double-Convex Lens 50 MM D X 20 CM FL 7-909-11 Double concave lenses Have two inwardly curved surfaces A negative focal length and are often Superior quality lenses are useful for teaching a variety of optical principles Lenses Double Concave 50 mm. D X 20 cm. fl.
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