Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 37
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… … 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…
Color-blindness · Eye
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