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 25
s as above. See page 47. § 13. Assuming the medium to divide the aerial space into negative andpositive regions (Figs. 8, 9) as indicated by the sign — (minus) on the in-cident side of the mediimi, and the sign -\- (plus) behind the medium, weshall find the focal point on the positive side for all… … ^M..........± t Fig. 10.
Lenses · Prisms (Ophthalmology)
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