Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 143
light ofvarious colors comes from the pin, and that the rays are notall refracted alike, the blue being refracted more than thered. The index of refraction is therefore different for lightof different colors, but for our present purpose we need notdwell upon that fact. We get a sort of average… … greatest in a so-called vacuum. It is least in the mosthighly refractive substances, and, indeed, the index of re-fraction for any given substance depends upon the rate atwhich light travels through it. This is sometimes illustrated by an analogy suggested by REFRACTION OF LIGHT. 131 the march of…
Physics
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