Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 137
1 meter = 100 centimeters.^ IP. D. + 1D. Fig. 1. upon a peripheral portion of the lens one centimeter from the opticalcenter (Fig. 1). The prism-dioptry therefore also represents the measure of the angle ofdeviation Yv ^^^ ^^ eccentricity or decentration of one centimeter (Fig. 1). 1 meter = 100- … 2 P. D. + 2 D. >i meter. Fig. 2. A ray impinging upon the same point of a 2-dioptry lens (Fig. 2) willsustain the same unit-deflection at its focus i meter, and will therefore findthe measure of its angle of deviation y^, expressed by twice the deflectionat the meter-plane, or 2 prism-dioptries.…
Lenses
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