Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 182
e,as also the angle of re-fraction PDSm, whilethe angle of reflexionPDSr, will always benegative, as it should be,since the velocity of thereflected light must becounted negative, thereflected wave being dri-ven back from the de-viating surface. § 13. When the deviating surface is curved, we con-^^… … § 14. The angle whichany ray after deviation,makes with the prolonga-tion of the same ray be-fore incidence, is calledthe deviation. Thus,Slv- D £, is the devia-tion by reflexion; andS D S1V; the deviationby refraction.
Mechanics · Acoustics · Optics
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