Sentence Examples


  • This was applied to an excellent achromatic telescope of 34 in.
  • It will be seen, then, that the visual and photographic foci are now merged in one, and the image is practically as achromatic as that yielded by a reflector.
  • If not, the substitution of an achromatic lens will be of no advantage.
  • He also succeeded in constructing an almost perfectly achromatic eye-piece, still known by his name.
  • Calculation shows that, if the aperture be s in., an achromatic lens has no sensible advantage if the focal length be greater than about II in.