The book The Theory of Light a Treatise On Physical Optics was written by author Richard Cockburn Maclaurin Here you can read free online of The Theory of Light a Treatise On Physical Optics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Theory of Light a Treatise On Physical Optics a good or bad book?
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Hence the crossing of such a line involves a change from one colour to the complementary one. If, however, the two factors of sin 2a . Sin 2/3 vanish simultaneously the neutral lines corre- sponding to the two factors coincide, and there is no change of sign or colour in crossing them. Such lines are called double neutral lines. If we are dealing with homogeneous light there will be a family of lines in the field of view, the retardation A being constant along any member of the family. With mos...t crystals the form of these lines is approximately independent of the wave length of the light. Hence if we use white light and keep to one of these lines the colour will be the same along any section of the line not crossed by a " single " neutral line. These lines are consequently spoken of as isochromatic lines. A third family of lines is sometimes employed to describe the phenomena. The angle POX in Fig. 74 represents the angle (a. ) between the principal plane of the polariser and the direction of displacement in one of the waves (say the quicker wave) within the crystal.
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