Advantages and disadvantages of refracting telescopes

aqa physics unit 5a 

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  • Created by: katherine
  • Created on: 17-05-12 21:53

disadvantages of refracting telescopes

  • mounting and support of the lens can only be made using the edge of it
  • it is hard to find glass free from impurities to make a large diameter
  • they are extremely heavy and can collapse under their own weight if they have a large diameter
  • suffer from chromatic AND spherical abberation
  • hard to manoever
  • difficult to mount heavy electronic and observing equipmet
  • requires large objective lenses and focal length
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advantages of reflecting telescope

  • large mirrors can be made which are light and supported from behind
  • can be made a few nm thick- excellent imaging
  • only use front surface- remove many problems associated with lenses
  • NO CHROMATIC ABBERATION and if parabolic NO SPHERICAL ABBERATION
  • easily transportable
  • smaller mirrors can be used to create a larger composite mirror
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