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Homework Help: Multiple Lense Problem !

  1. May 23, 2007 #1
    1. The problem statement, all variables and given/known data;

    A Converging Lens, with focal length of 10 cm, is 60 cm to the left of a Diverging Lens, with focal length 15 cm. The Object distance is 30 cm to the left of the Diverging Lens. What is the total distance between the starting object and the final image?

    2. Relevant equations;
    1/f = 1/o + 1/i

    3. The attempt at a solution;
    I tried to solve this problem, but I can't understand how to do it because it is a multiple lens problem, however, the object is in the middle of the two lenses. Any help?

    (Need a Diagram as well)
  2. jcsd
  3. May 24, 2007 #2


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    Homework Helper

    The real object is to the left of the converging lens. It forms an image at the given distance of 30 cm from the diverging lens. This image is now the object for the diverging lens. The problem requires you to calculate the distance between the real object to the left of the converging lens and the final image formed by the diverging lens.
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