Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 43
rically-refracting equivalents. According to Eule 1, § 34, as an instance, the concave sphero-cylin-drical lens — 1.25 sph. C — 0.75 cyl. axis 1G0° may b? converted into the periscopic form — 2 sph. C + 0.75 cyl. axis 70°, and vice versa, according to Eule 2, § 34, *The meridian of greatest… … Fig. 28.Concave Sphero-cylindrical Lens {— s^ :::::. —c^ axis 90°)—Double Form.
Lenses
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