Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 31
/** areassociated with refraction in the horizontal, and i^ and f^ with refractionin the vertical plane. In a practical experiment in which the lens is held at some distancefrom the eye, convex cylindrical refraction manifests itself by an apparentincrease, and concave cylindrical refraction by an… … Fig. 19. Fig. 20. Axis vertical; Refraction horizontal. Axis horizontal; Refraction vertical.Plano-concave Cylindrical Lenses. § 21. To obtain cylindrical refraction of equal amount in both planes,thereby reducing the focal line to a focal point, it would be necessary tocombine two identical…
Lenses
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