Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 27
as above. See page 47. § 13. Assuming the medium to divide the aerial space into negative andpositive regions (Figs. 8, 9) as indicated l)y the sign — (minus) on the in-cident side of the medium, and the sign 4- (plus) behind the medium, weshall find the focal point on the positive side for all… … Fig. 10. Fig. 11. § 14. By substituting, in Fig. 8, for the plane side, a curvature c^ con-centric with c% the refractive effects of the sections. Fig. 8 and Fig. 9, arevirtually united, as showTi in Fig. 10. Owing to the concave curvature cSthe incident ray i will assume the direction e^-e, being…
Lenses
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