Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
idenceis called the plane of incidence. The plane of the normal and thereflected ray is called the plane of reflection. 291. Figure 20.—Laws which govern the reflection ofheat. 1st. The planes of incidence and reflection coincide. 2d. The angles of incidence and reflection are equal. Let W be a tin… … reflecting surface. The surface. J, radiates heat in all directions, but,by means of the screen, T, as shown, only a single ray is permitted tofall on the reflector. By this apparatus it is demonstrated that, what-ever be the value of the angle of incidence, the planes JLX and NLFcoincide Avith…
Physics · Astronomy
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