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
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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