Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 28
, which, however, is a special case. § 15. Hence, in a pair of united convex and concave sections of identicalcurvature, it follows that the effect of the one is neutralized by the other,respecting the existence of a focal point on either side of the medium.This, however, is strictly only true for… … V- Fig. 12. Periscopic convex section.Positive meniscus. Periscopic concave section.Negative meniscus. Referring to the periscopic convex and concave sections. Fig. 12 andFig. 13, respectively, if we consider the refraction merely with respect tothe front curvature c^ disregarding the existence of…
Lenses
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