Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 38
this possible though erroneous impression. CONGENEKIC MERIDIANS, 33 In the convex sphero-cylindrical lens of double form. Fig. 25, if weconsider the refraction for each surface independently of the other, weshould find a focal point at F^ for the convex spherical surface, s, and afocal line, say at… … Fig. 26.Convex Sphero-cylindrical Lens (+ ■f^ O — d axis 90°)—Periscopic Form. The final rays from the outermost points, e°, in the horizontal planebeing directed to the focal point F^, it is evident that focal line i^ F^ l^must become subject to the influence of the spherical refraction in…
Lenses
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