Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 30
Fig. 17. Fig. 18. Axis vertical; Refraction horizontal. Axis horizontal; Refraction vertical. Plano-convex Cylindrical Lenses. A similar succession of the radial centers (c) establishes a line (.4 c A),termed the axis of the so-created cylindrical medium or lens, which isparallel to the focal line…
Lenses
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