Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 180
n produces the arms of the cross.With monochromatic light the rings would be simplybright and black—the bright rings occurring at thosethicknesses of the spar which cause the rays to con- IV. UNIAXAL AND BIAXAL CRYSTALS. 14J spire; the black rings at those thicknesses which causethem to quench each… … as elsewhere, the different lengths of the light-wavesgive rise to iris-colom-s when white light is employed.Besides the regular crystals which produce double Fia. 49.
Light
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