Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1907)
Prentice, Charles F. (Charles Frederick), b. 1854 · Philadelphia : Keystone · leaf 43
her diamet-rically-opposed coordinate meridian. As an instance, we may select thecompound lens Fig. 30, represented as consisting of a plano-concave, c%and a plano-convex cylinder, c, so combined as to place their active me-ridians at right angles to each other. 39 40 COMPOUND LENSES. Independently… … k^- Fig. 30.Concavo-convex Cylindro-cylindrical Lens (— c axis 90° C: + c^ axis 180°). When the cylinders are associated, however, the final rays, which wouldhave been restricted to the limits of the focal line F F~ P for the cylinderc^ will, by virtue of the dispersive effect of the cylinder d in…
Lenses · Prisms (Ophthalmology)
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