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Two thin converging lenses and intermediate image.

  1. Nov 4, 2009 #1
    1. The problem statement, all variables and given/known data
    Here is the layout of 2 lenses:


    Two thin lenses, numbered 1 and 2, with the intermediate image "I" is to the right of one of the lenses. The distance between the lenses is lettered d.
    Both lenses have the same focal length, f.

    Find the final image.

    2. Relevant equations
    1/p + 1/q = 1/f

    3. The attempt at a solution

    What confuses me is how can the intermediate image be to the left.
    I'm not sure where the light should be coming from.
  2. jcsd
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