Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 32
generally be accepted as a vanishing quantity in proportion tothe focal distance, we may consider a common focal point to exist for bothrefractino- surfaces. … Fig. 22.Plano-convex Spherical Lens. § 23. Practically, however, it would be better to create a single surfacecapable of producing this amount of refraction in the vertical as well as inthe horizontal plane. With this object in view, we shall select the isolatedvertical section described in § 10,…
Lenses
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