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Easy optics

  1. May 10, 2009 #1
    in a refracting telescope, the lens's diameter is 1.02 m and its focal length is 19.4 m.
    how long must the telescope be to get an image, 40 times bigger?

    i would also like to get a link to a site explaining this kind of elementary optics.
  2. jcsd
  3. May 10, 2009 #2
    just saw the warning, please dont delete my posts :S they are in a close enough format i think..
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