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 28
ion. § 18. In the bi-convex and bi-concave sections Fig. 14 and Fig. 15 it canbe similarly shown that the curvature c^ increases the refraction of cS so SlMlLE LENSES. 25 that the total refraction is expressed by the sum of the apportioned numer-als and bears the sign associated with the respective… … Fig. 16. § 19. For a medium (Fig. 16) composed of parallel vertical sections, eachadjacent imaginary section has its corresponding focal point at the samedistance (D) from the medium, so that the refraction for all central in-cident parallel rays becomes manifest by establishing a succession of…
Lenses · Prisms (Ophthalmology)
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