Simple Spherical Double Convex lenses having two out side curved parallel surfaces to each other and used for magnification and converging the light and having a positive focal length. Similarly Spherical Double Concave lenses having a negative focal length and two inwards...
50 mm diameter with ground and polished faces and ground edges. Comprises one each of the following:- Double convex, Plano-Convex. Converging concave-convex, Diverging concave-convex, double concave, Plano-concave. Supplied in a velvet lined box....
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