On the Double Refraction and Polarisation of Light [By Sir D. Brewster]

On the Double Refraction and Polarisation of Light [By Sir D. Brewster]

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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. 1829 edition. Excerpt: ...appear for each colour of perfect regularity and form remarkably well defined, and contracting rapidly m size as the illumination is made with more refrangible light; but, in addition to this, it will be observed that the whole system appears to shift its place bodily, and advance regularly in one direction as the illumination changes; and, if it be alternately altered from red to violet, and back again, the pole, with the rings about it, will also move backwards and forwards, vibrating, as it were, over a considerable space. If homogeneous rays of two colours be thrown at once on the lens, two sets of rings will be seen, having their centres more or less distant, and their magnitudes more or less different, according to the difference of refrangibility of the two species of light employed." This description will be understood by referring to fig. 27, where we may suppose the rings round A to be those viewed by the observer. In violet light, they will approach towards CD, and within 28 of it, while, in red light, they will recede from CD as far as 38, the rings formed by intermediate colours having intermediate positions, the centres of all these systems of rings lying in one plane, viz. that of the principal section of the crystal passing through AB. These results will be still better seen by using a crystal, in which both the systems of rings round A and B are seen at once. The centres AB of the two systems will approach to, and recede from, each other, according as violet or red light is used; so that, when white light is used, all the systems, when seen at once, will form a most irregular system. In the rings of topaz, and of other crystals, Dr. Brewster observed the tints to commence from black, at points which he called virtual poles, ...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123655194X
  • 9781236551948