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 34
and F^, and with an ap-proach of mr 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 magnitl^de.This astigmatic pencil, if intercepted at intervals by a transverse…
Lenses · Prisms (Ophthalmology)
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