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
on. § 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 c^, so SIMPLE LENSES. 25 that the total refraction is expressed by the siun of the apportioned numer-als and bears the sign associated with the… … 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
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