different densities in different direc- paper held over the bar magnet, various forms were pro- parallel to the tourmaline, and not along the former which tions, and the consequence is that some of these media duced. This experiment was represented optically by means is perpendicular to it, the… … Ba lens above which are two small magnets around which ray. The other does not; its index of refraction, for exam- THE NICOL PRISM. iron filings were scattered, and C a prism deflecting the ray ple, is not constant, nor do the incident and refracted rays We have seen the two beams emergent from…
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