Light; a Course of Experimental Optics, Chiefly With the Lantern
The book Light; a Course of Experimental Optics, Chiefly With the Lantern was written by author Wright, Lewis, 1838-1905 Here you can read free online of Light; a Course of Experimental Optics, Chiefly With the Lantern book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Light; a Course of Experimental Optics, Chiefly With the Lantern a good or bad book?
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266 LIGHT. [chap. slide — say a concave Newton's iring slide. The rings being at their brightest, and with the analyser exactly crossed, introduce, in front of the selenite, the rotating tourmaline at an angle of 45° This stops by absorption one of the two oblique rays into which the original polarised beam is divided ; there are no longer two rays to be brought into interference, and accordingly, over the area covered by the tourmaline, the colours disappear. Secondly, we may retard the other ...ray, and thus bring the two again into coincidence. If one ray be retarded in the selenite more than that vibrating at right angles to it, it is plain that, taking two selenites of equal thickness, if both are superposed the same way of the crystal, the colour must be that of a plate equal to the sum of both ; but that if one be turned round 90°, the retardation of one ray by the first must be neutralised by the second, and no colour at all pro- duced. If we place two similar films in the stage, in the two different separate positions, we find that it is so ; and similarly, if the films be of different thickness, the colour will be in one position that of their sum, and in the other of their difference.
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