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Homework Help: Geometrical Optics

  1. Apr 17, 2007 #1
    1. The problem statement, all variables and given/known data

    Explain why for a given object screen distance there are two positions where the image is in focus. Is this always true?

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 17, 2007 #2

    berkeman

    User Avatar

    Staff: Mentor

    Two positions of what, the lens? What kind of lens? What is the background for this question? What are the relevant equations?
     
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