Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 223
radii or distances are unequal. A plano-convex lens. Fig. 2582, is bounded by a plane surface on one side, and by a convex one oothe other. A double concave lens. Fig. 2583, is bounded by two concave spherical surfaces whose centres are onopposite sides of the lens. A plano-concave lens. Fig. 2584,… … The focal distance, of distance of the focus from the surface of the lens, depends botli upon the formof the lens and of the refractive power of the substance of which it is made; in a glass lens, both sidesof which are equally convex, the focus is situated nearly at the centre of the sphere of…
Mechanical engineering · Mechanics · Engineering
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