Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 49
Fig. 3c Fig. 34. Such a surface, called a torus, is shown in Fig. 33, wherein the curva-ture c^ of the radius r^ and refraction 3D. is rotated upon a vertical axis Rso as to create the curvature c^, whose radius r~ is chosen to produce 2D. In Fig. 34 two lenses are shown to be included within the…
Lenses
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