Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 36
and F^, and with an ap-proach of m- toward F- for these points of intersection of the final ray /with the respective focal lines F^ d^ and F^ d^. The reverse is evident foran advancement of e towards e^. (See Fig. 25a.) … Fig. 25a. § 27. The total refraction for all incident parallel rays within the areaof the circle C will therefore result in an astigmatic pencil whose focallines, d^ F^ d^ and d~ F^ d-, are limited as to position and magnitude.This astigmatic pencil, if intercepted at intervals by a transverse…
Lenses
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