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Homework Help: Telephoto lens and focal length being longer that single lens.

  1. Sep 17, 2010 #1
    1. Why is a telephoto lens considered to have a longer focal length than that of a single convex lens?

    A lens combination, such as a diverging and a convex lens, is referred to as a telephoto lens. Suggest why a telephoto lens is considered to have a longer focal length than that of a single convex lens.
     
  2. jcsd
  3. Sep 17, 2010 #2
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