Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 121
t of it, at a distant point of light, the pointis seen encircled by a series of coloured bands. If 90 ON LIGHT. i.F.cr. taonochromatic light be used, these bands are simplybright and dark, but with white light the circles displayiris-colours. If a slit be shortened so as to form asquare aperture,… … light is observed. Througli two square apertures, withtheir corners touching each other as at A, Schwerdobserved the appearance shown in fig. 22. Adding twoothers to them, as at B, he observed the appearancerepresented in fig. 23. The position of every bandof light and shade in such figures has…
Light
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