Elements of natural philosophy (Volume 2-3) . incident upon the boundary of a medium of different density from that in which it is moving, it will be resolved into two component wTaves, one of which will be driven back from the bounding surface, while the Follows the samt other will be transmitted and conducted through the newlawsassoll]ld; medium. Light, like sound, will, therefore, be reflected and refracted, and according to the same laws. 172 NATURAL PHILOSOPHY. And the circumstances ofincident anddeviated lightdetermined bythe sameequation. 10. And resuming Equation (29), Acoustics, which
Elements of natural philosophy (Volume 2-3) . incident upon the boundary of a medium of different density from that in which it is moving, it will be resolved into two component wTaves, one of which will be driven back from the bounding surface, while the Follows the samt other will be transmitted and conducted through the newlawsassoll]ld; medium. Light, like sound, will, therefore, be reflected and refracted, and according to the same laws. 172 NATURAL PHILOSOPHY. And the circumstances ofincident anddeviated lightdetermined bythe sameequation. 10. And resuming Equation (29), Acoustics, which is v . sin. 9 = -y? sin. 9 • • . . (i) we may determine all the circumstances of velocity anddirection of incident, reflected and refracted light. Inthis equation V, denotes the velocity of light in the first,and V, its velocity in the second medium ; 9, the angle ofincidence, and 9, that of refraction. Deviatingsurface; Incident,reflected,refracted wave; Incident,reflected,refracted ray; Angle ofincidence, ofreflexion, § 11. Let us here repeatthe notation -of § 71, Acous-tics. The surface whichseparates the two media,and of which M J\T, repre-sents a section by a normalplane, is called the deviatingsurface / and, supposing thewave to be moving from Stowards D, WW is calledthe incident, W W thereflected, and WW the refracted ivave; and the normals to these, viz.: S D,D Sf and D S, are called, respectively, the incident, re-flected, and refracted ray ; the ray D 8 is said to be de-viated by reflexion, saidDS by refraction ; also drawingthe normal P Pr to the deviating surface, the angleP D S, which the incident ray makes with this normal, iscalled the angle of incidence; the angle P D S, which thereflected ray makes with the normal, is called the angle ofreflexion, and the angle PD Sm = P D S, which therefracted ray makes with the normal, is called the angleof refraction. How these angles § 12. These angles are always estimated from that part are estimated
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