Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 209
-40. It will be convenient to express the relation inEquations (32), (33), (34), &c, by referring to the centre 200 NATURAL PHILOSOPHY. To find a relation of curvature of the deviating surfaces as an origin. For between the ^Jg pnrpose \et Q J) conjugate focal L x distances when be a section of… … Substitutions andreductions; f = r + c, which in Equation (19), give, after reduction, Eclation for onesurface; 1 m — \ m = + — ore (36) and for a second deviating surface whose centre of curva-ture is at a distance £, from that of the first, we ob-tain from Equation (36), For a secondsurface; nif…
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