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 27
efrac-tion for the respective sections is equivalent to the difference of the appor-tioned numerals, and bears the sign corresponding to the more acute cur-vature &. Supposing, in a periscopic convex section, 2.5D. to be the prescribednumeral of refraction for the convex, and 0.50D. for the… … Fig. 14.Double or Bi-convex section. Fig. 15.Double or Bi-concave section. § 18. In the bi-convex and bi-concave sections Fig. 14 and Fig. 15 it canbe similarly shown that the curvature c^ increases the refraction of cS so SlMlLE LENSES. 25 that the total refraction is expressed by the sum of the…
Lenses · Prisms (Ophthalmology)
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