Capable of being turned from a raight line. R. Equivalent. See Power, Specific. R. Index. Same as Refraction, In- ‘ex of, q. v. R. Power, the measure of influence fhich a transparent body exercises on the light which asses through it. R. Power, Specific, an almost onstant quantity representative of the relation between ae coefficient of refraction, the temperature, and the specific gravity of a given fluid.
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