Elements of natural philosophy (Volume 2-3) . § 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 The deviation ; By reflexion andby refraction. § 15. If we make v m. (2) 174 NATURAL PHILOSOPHY. Equationapplicable to refraction ; Equation (1) becomes sin cp = m sin 9 (3) Equationapplicable toreflexion; which answers to any refracted ray. For the reflected ray, V becomes equal to — V\ and — 1 = m\ this in Equation (3) gives sm 9
Elements of natural philosophy (Volume 2-3) . § 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 The deviation ; By reflexion andby refraction. § 15. If we make v m. (2) 174 NATURAL PHILOSOPHY. Equationapplicable to refraction ; Equation (1) becomes sin cp = m sin 9 (3) Equationapplicable toreflexion; which answers to any refracted ray. For the reflected ray, V becomes equal to — V\ and — 1 = m\ this in Equation (3) gives sm 9 = — sin 9 (*) which applies to all cases of reflexion. And generallywe may consider the Equation General equationfor all deviations. sm 9 = m sm 9 (5) as applicable to all cases of deviation, observing to makem, equal to minus unity in cases of reflexion. « § 16. The circumstances attending the deviation of the Catoptrics and component waves into which an incident wave is re-Dioptrics. .... solved at a deviating surface, being m general different, gave rise to two distinct branches of optics, calledCatoptrics and Dioptrics, the former treating of re-flected, and the latter of refracted light. But by thegeneralization expressed in Equation (5), this
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