• J. E. van Zyl


Good progress was made in the development of the telescope during the first half of the 17th century. The first telescopes were refractors, having an objective lens and ocular, or eyepiece, on the optical axis. The principle of the refractor is illustrated in Figure 4.1.


Focal Length Objective Lens Celestial Body Hubble Space Telescope Chromatic Aberration 
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Copyright information

© Springer-Verlag London Limited 1996

Authors and Affiliations

  • J. E. van Zyl
    • 1
  1. 1.NorthcliffRepublic of South Africa

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