Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 46
-. By projecting thefinal rays into the region of their apparent emanation from before the lens,we would obtain a similar increase of the virtual focal line P F^ P to themagnitude d^ F^ d^, and to a reversal of the so-defined ellipses, respectingtheir greatest and least diameters, as shown by the… … Fig. 31.Concavo-convex Sphero-cylindrical Lena {4- s^ C::. — r axis 90°) The combination of a convex spherical surface with the active meridianof a stronger concave cylinder creates a periscopic section which is concave;whereas the combination of a concave spherical surface with the activemeridian…
Lenses
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