Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 40
to become thoroughly familiar with the meridians ofgreatest and least refraction, it is considered expedient to picture these intheir respective planes of activity, V and H, as shown in their correlative * Wherein the rays are incident In the immediate vicinity of the optical axis, and the… … Fig. 24a. Fig. 2oa. Fig. 26a. Formula la. + 3.5 cyl. axis 180° C + 1.5 cyl. axis 90°. ^. f + 3.5 vertical 3 + 1-5 horizontal = + 3.5V C^ 4- 1.5H. Fig. 24a. ) . ^ . Formula Ila. + 1.5 spherical 3 + ^ cyl. axis 180°. Refraction: I _^ g + 1.5 vertical C + 1.5 horizontal = + 3.5V C + 1-5H.Fig. 25a. )…
Lenses
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