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 44
f a convex spherical surface with the active meridianof a stronger concave cylinder creates a periscopic section which is concave;whereas the combination of a concave spherical surface with the activemeridian of a stronger convex cylinder results in a periscopic section whichis convex. The identity… … ..i-- « U-- Fis. 32. Concavo-convex Sphero-cylindrical Lens (—s^ O + ^* axis 180°). and cylindrical curvatures, according to § 32, the demanded positive andnegative elements of refraction for the principal meridians of the crossedcylindrical lens, Fig. 30, are fulfilled. 42 COMPOUND LENSES. To…
Lenses · Prisms (Ophthalmology)
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