Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
ferred, that there are really only three, instead of seven. 240 OPTICS. primary colors, red, yellow, and hlue; the other four being consideredas aecondary colors of the spectrum. 4^S. Figure 47.—Union of t-wo primary colors of thespectrum, to produce a secondary color.—Let a solar ray oflight be… … will be still further refracted, but not dispersed. If, by means of thedouble convex lens, L, they be converged so as to meet on the screen S,they will form green. By the same process it is found that yellow and red form orange;red and blue form violet and indigo. Still, no two colors alone make…
Physics · Astronomy
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