Treatise on Optics

Treatise on Optics

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 edition. Excerpt: ...we have stated that the ray restored by two reflexions has its plane of polarization brought into the state of--17. The following are the inclinations of this plane to the plane of reflexion, by different numbers of reflexions from steel and silver: --These results explain in the clearest manner why common light is polarized by steel after eight reflexions, and by silver not till after thirty-six reflexions. Common light consists of two pencils, one polarized + 45, and the other--45; and steel brings these planes of polarization into the plane of reflexion after eight reflexions, while silver requires more than thirty-six reflexions to do this. (132.) The angles at which elliptical polarization is produced by one reflexion may be considered as the maximum polarizing angles of the metal, and their tangents may be considered as the indices of refraction of the different metals, as shown in the following table: --Elliptical polarization may be produced by a sufficient number of reflexions at any given angle, either above or below the maximum polarizing angle, as shown in the following table for Steel: _ When the number of reflexions is an integer, it is easily understood how an elliptically polarized ray begins to retrace its course, and to recover its state of polarization in a single plane, by the same number of reflexions by which it lost it; but it is interesting to observe, when the number of reflexions is 1, 2', or any other mixed number, that the ray must have acquired its elliptical polarization in the middle of the second and third reflexion; that is, when it had reached its greatest depth within the metallic surface it then begins to resume its state of polarization in a single plane, and recovers it at the end of 3, 5, and 7, reflexions. A.
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Product details

  • Paperback | 134 pages
  • 189 x 246 x 7mm | 254g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 123652649X
  • 9781236526496