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Lectures on the Sub-Divisions of Knowledge, and Their Mutual Relations. Delivered in the Benares Sanskrit College Volume 1

Lectures on the Sub-Divisions of Knowledge, and Their Mutual Relations. Delivered in the Benares Sanskrit College Volume 1


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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. 1848 Excerpt: ...the lens of the eye can effect the rest. By interposing a very refractive lens, a small object may be viewed distinctly when brought very near the eye; and then appears to be proportionately magnified. Such a glass is called a microscope. A small convex lens may be obtained by piercing a small circular hole in a slip of metal, and introducing into it a drop of water, which will assume a spherical form on each side of the metal. Objects looked at through this will appear magnified. The operation of a concave lens is the reverse of that of a convex lens. Objects seen through a concave lens are diminished. In some young persons the lens of the eye is so highly convex that the rays come to a focus before they reach the retina.--From this focus the rays proceed divergently and consequently form a very confused image on the retina. Such persons see an object distinctly when very near the eye. When reading, they hold the book close to their nose. Short sighted persons may enable themselves to see clearly at five inches distance by placing a concave lens before the eyes, in order to increase the divergence of the rays. Short sighted people may comfort themselves with the reflection that their eye, by the flattening of the lens, may begin to improve, when the sight of other people is beginning to fail. There are other objects which though not really small, appear so to us, from their distance. In order to see these distinctly, we employ a Telescope. The simplest form of Telescope consists of a convex lens fixed at the end of a tube, by which the rays from a distant object are made to converge; whilst the rays, before they come to a focus, are received on a concave lens which causes them to diverge so far as is necessary to give distinct vision. The object is thus se...


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Product Details
  • ISBN-13: 9781130193541
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130193543
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr

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Lectures on the Sub-Divisions of Knowledge, and Their Mutual Relations. Delivered in the Benares Sanskrit College Volume 1
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