Applied Optics, the Computation of Optical Systems; Being the Handbuch Der Angewandten Optik of Dr. Adolph Steinheil and Dr. Ernest Voit Volume 1

Applied Optics, the Computation of Optical Systems; Being the Handbuch Der Angewandten Optik of Dr. Adolph Steinheil and Dr. Ernest Voit Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...in the case of the peripheral ray of the first colour, not only is its focus coincident with that of the axial ray, but also the distance of the principal point (situated upon the spherical principal surface) from the focus is the same, then there is no distortion for this particular colour, since a system that has for both axial and peripheral rays the same true focal length must have for both axis and periphery the same magnification. If the principal points are also the same for this second colour, the image formed by rays of the second colour will also be undistorted, and will have the same magnification as the image formed by rays of the other colour for both the periphery and the centre of the system. The image will in such a case be completely achromatic; that is, the rays for any two colours that before the first refraction were constituents of a white ray will be so refracted through the system that on emergence they will again form a white ray, and that they will emerge from the same part of the last surface of the system, and be directed towards the same point. II. In the case of the second image point lying out of the axis it is necessary to trace the path of four rays. There should first be selected the ray that passes undeviated through the system, that is, the principal ray. As already stated, this ray makes the same angle, -1-, with the axis on incidence as it does on emergence. This particular ray, which may be regarded as the axis of the beam proceeding from the object point situated out of the axis of the system, intersects the image surface at a height, h', equal tofsin 1-. Around this principal ray the entering beam is symmetrically arranged, and of this beam three peripheral rays should be selected....show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123675087X
  • 9781236750877