Polished 90 mm dia & 20 mm thick approx.
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Plane, circular, ground edges. Back silvered with protective coating
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Six lenses with ground & polished faces & ground edges. Comprises one each of: double convex, plano convex, converging concave-convex, diverging concave-convex, double concave, & plano concave. Supplied in a velvet lined box.
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