. Color-vision and color blindness, a practical manual for railroad surgeons . Fig. 6.—Diagram illustrating the Decomposition of White LightAND Formation of the Solar Spectrum. shape of the spectrum is due to the fact that the violetend is more refrangible than the red end, and in conse-quence the violet rays are deflected more to the base ofthe prism. (See Fig. 6.) This quality of colored rays causes a slight degreeof chromatic aberration which, in the eye, is hardlynoticeable unless demonstrated by experiment. If wepaste two narrow strips of paper, one red and the otherviolet, close to each
. Color-vision and color blindness, a practical manual for railroad surgeons . Fig. 6.—Diagram illustrating the Decomposition of White LightAND Formation of the Solar Spectrum. shape of the spectrum is due to the fact that the violetend is more refrangible than the red end, and in conse-quence the violet rays are deflected more to the base ofthe prism. (See Fig. 6.) This quality of colored rays causes a slight degreeof chromatic aberration which, in the eye, is hardlynoticeable unless demonstrated by experiment. If wepaste two narrow strips of paper, one red and the otherviolet, close to each other on a black ground, and look atthem through a prism, we shall find that the red stripis displaced to a less extent than the violet; hence less (19) 20 COLOR-VISION AND COLOR-BLINDNESS. refrangible. Another experiment is to stand twenty feetfrom a candle or other small light and exclude all butthe red and blue rays by looking through a cobalt-blueglass; the red and blue rays separate as soon as theyreach the eye, and, as the blue rays are more refrangible,. 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 would in hypermetropia, we see a bluecentre with a red fringe; if at / (emmetropia), the redand blue rays coincide, and we see a clear image of the
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