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Newtons Disk

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-479

2025-12-21

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Newton's Disk -Sir Isaac Newton used a method of combining colors that depends upon the principle of persistence of vision in the eye. If a cardboard disk is painted red on one sector and yellow on the other, as in A (Fig. 1), and if it is then rapidly rotated on an axis passing through the middle of the disk, the color will appear to the eye to be orange. This is purely a physiological result, the red sensation following the yellow sensation so quickly that the result is a combination of the two. If violet and red are used instead of yellow and red, the result will be purple. Combinations of any colors, in any proportions, can be made by having a disk of each color slit radially, as B in Fig. 1, so that they can be slipped over one another while on the axis.