Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 147
noticed. Eed light is deviatedless than blue light. 3d. On the angle tvhich the ray makes with the first sur-face. The total deviation is least when the ray strikes in sucha way as to follow, within the prism, a course parallel toZE7, .Fig. 99, which makes the distance AI equal the dis-tance AE,… … clination which gives a less total deflection of the light than anyother position. REFRA CTION OF LIGHT. 135 4th. On the material of the prism. All kinds of glass do not refract equally. 134. Dispersion: The Spectrum.—The separation of raysof different colors by a prism is called dispersion. The…
Physics
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