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Plano Cylindrical Concave Lens, 17 Diopter, 50 x 50mm Subcategory_Temperature and Heat supplied on a plastic and metal rack supplied on a plastic and metal rack with a carrying handle for classroom transport this mechanical stopwatch reads to one fifth of a second on an analog dial Plano cylindrical concave lens at 50 by 50mm with 17 diopter power the cylindrical concave curvature spreading light along a single axis for line focus and divergence demos
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