Polarisation of Light

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Macmillan and Company, 1891 - Polarization (Light) - 151 pages
 

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Page 103 - ... and 90° the rings will be contracted and extended in opposite quadrants until at 45° they are divided by two diagonals, on each side of which the colours are complementary. Beyond 45° the rings begin to coalesce until at 90° the four quadrants coincide again. During this movement the centre has changed from bright to dark. If the motion of the analyzer be reversed, the quadrants which before contracted now expand, and vice versa.
Page 120 - Helmholtz, viz. that the low-tint colours (couleurs degrade'es'), such as russet, brown, olive-green, peacock-blue, &c., are the result of relatively low illumination. He mentioned that he obtained these effects by diminishing the intensity of the light in the colours to be examined, and by, at the same time, maintaining a brilliantly illuminated patch in an adjoining part of the field of view. If therefore we use the combination...
Page 112 - The results of combining two or more colours of the spectrum have been studied by Helmholtz, Clerk Maxwell, Lord Rayleigh, and others ; and the combinations have been effected sometimes by causing two spectra at right angles to one another to overlap, and sometimes by bringing images of various parts of a spectrum simultaneously upon the retina. Latterly also W. v. Bezold has successfully applied the method of binocular combination to the same problem (Poggendorff, Jubelband, p. 585). Some effects,...
Page 65 - ... cleavable into thin laminae capable of showing the colours of polarized light, it is most frequently employed in experiments on chromatic polarization. The laminae into which this substance most readily splits, contain in their planes the two optic axes ; polarized light transmitted through such laminae is resolved in two rectangular directions, which respectively bisect the angles formed by the two optic axes : the line which bisects the smallest angle is called the intermediate section ; and...
Page 62 - ... reflected unaltered by the silver plate ; but when the ring is turned to 45°, 135°, 225°, or 315°, the plane of polarization of the ray falls 45° on one side of the plane of reflection of the silver plate, and the ray is resolved into two others, polarized respectively in the plane of reflection and the perpendicular plane, one of which is retarded on the other by a quarter of an undulation, and consequently gives rise to a circular ray, which is right-handed or left-handed according to...

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