the matter is oneof psychology more than of physics. COLOR-VISION THEORIES. 29 According to the Yoimg-Helmholtz theory, the retina con-tains three distinct sets of nerve-fibers, each giving only asingle sensation, no matter what particular part of the spec-trum corresponds to the light that does… … sensations is stimulated by light from different parts of thespectrum. In order to clearly understand these curves, con-sider how the spectrum would appear to a person whose eyeswere provided with the red-sensitive nerves, but not with theother two sets. Tie would be able to see the spectrum…
Light
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