Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 37
Fig. 7.—Diagram illusteating Chromatic Aberration. d d, the dioptric surface; d b, the blue, and d r, the red rays; B, the focal plane of the blue,and R, of the red rays. they come to a focus at B (Fig. 7), while the red raysfocus at R. If the rays be supposed to fall on the retinaat B, as they… … Fig. 8.—Diagram ili^ustrating the Impo.ssibility of FurtherDecomposing Spectral Rays. cobalt; if at B (myopia), we see a red centre with ablue fringe. The spectral rays are saturated or simple colors ; thatis, they cannot further be decomposed by a prism. If allof the rays of the spectrum, except…
Color-blindness · Eye
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