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Home > Biographies & Memoire > Biography and non-fiction prose > Anthologies: general > Ocular Refraction and the Shadow Test
Ocular Refraction and the Shadow Test

Ocular Refraction and the Shadow Test


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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. 1903 Excerpt: ...upon the principles of refraction with which the student is now familiar. The eye, as an optical instrument, is frequently compared to a camera, and, no better comparison could possibly be made. To make good photographs the refracting system must be perfect and the screen, or plate, must be "in focus." In order that perfect vision may be had, the refraccing system of the eye must be free from errors and the retina must be situated at the focal point of the system. Figure 92. Sectional view of a camera, the parallel lines represent liglit rays enuring the lens and brought to a focus on tl.e plate. In figure 92 is shown a sectional view of a camera, the lens tube, projecting from the body of the camera, carries the refracting system. The parallel lines represent light rays from an object more than twenty feet distant, they enter the lens aperture and x1ndergo refraction by the achromatic lens; just behind the lens is situated the diaphragm, which cuts out the marginal rays and corrects the spherical aberration. Beyond the diaphragm, the rays are seen converging to a point upon the sensitive plate at the back of the camera. The bellows arrangement for focussing the camera, by changing the position of the plate with regard to the lens, is not shown in the diagram, everyone knows how a camera is made and it was not thought necessary to show this. The parallel rays shown in the figure are supposed to come from a single point upon the object, their focus thus represents but a single point in the image. The image of the object is made up of innumerable focal points, in fact, in order to be a perfect image, it must consist of the focus of rays of light from every point of the object. Figure 93. Sectional view of the eye showing lhe similarity to the action...


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Product Details
  • ISBN-13: 9781151760685
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 66
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1151760684
  • Publisher Date: 19 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr


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