explained in Section 45 how this may bedone with the aid of a drawing board and pins and have seen. 109-110] THE SPECTRUM. COLOUR. 183 Section 43, that the refracted beam is coloured. Newtons ex-periments have shewn in a general way the cause of the colour,it remains to trace more accurately the… … Fig. 125. tion into the glass into its coloured components; this dispersionis still further increased by the refraction at emergence, andthus the emergent beam is coloured. If we could isolate asingle ray its path would be as shewn in fig. 125. Each of itsvarious components would be deviated from…
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