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Principles of Physics, or Natural Philosophy

Principles of Physics, or Natural Philosophy


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About the Book

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. 1871 Excerpt: ...can be so adjusted as to illuminate the object by a con-centrated pencil of transmitted light. In using this microscope, the eye is placed over the lens o, which may be elevated or depressed till the focus is adjusted to give the most distinct view of the object on the stage. Opaque objects are illuminated by a bull's eye lens. By using lenses of different foci, magnifying powers may be obtained with this instrument, varying from two to one hundred and twenty diameters. 496. The compound microscope consists, essentially, of two lenses, so arranged that when an object is placed 37S a little beyond the principal focus of the first lens, its image may be formed in the principal focus of the second lens, by which it is viewed as an object is viewed by a common magnifier. The arrangement of the lenses in the compound microscope is shown in fig. 378, and also the position of the object, and the images both real and virtual. The object, s r, being placed near the first lens, aft,3 called the object-glass, an image, inverted and much enlarged, is formed at R S, in the focus of the second lens, dc, called the eye-glass. By this lens, the rays are transmitted slightly divergent, and in the exact condition to produce distinct vision when viewed by the cyo. The rays transmitted through the eye-glass, if traced backward to th- distance of distinct vision, form a virtual image at R' S', much larger than th- real image R S, formed by the action of the first lens. Such a compound microscope as the one shown in this figure, is subject to chromatic and spherical aberration, and the image viewed by the eye is not straight as shown in the figure, but curved so as to appear convex towards the eye. These imperfections are almost entirely corrected in the achromatic com...


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Product Details
  • ISBN-13: 9781231294123
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 310
  • Spine Width: 17 mm
  • Width: 189 mm
  • ISBN-10: 1231294124
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 558 gr

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