Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 516
d rays would be formed behind the retina, and that due to the violetrays would be in front of it. In the image on the retina the most intenserays—such as the orange, yellow, and green—are those which are blendedby the adjustment of the eye, and the red and violet form images moreout of focus (to… … but the fringe is too narrow, and the colour itself too feeble, to becomeperceptible. When, however, the pupil of the eye is half covered, the redand violet images are displaced in different directions, the position of theretina being too far forward for the one, and too far back for the other.…
Inventions
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