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Homework Help: Two converging lens, find the final image...

  1. Jul 31, 2016 #1
    1. The problem statement, all variables and given/known data

    lens problem.PNG

    2. Relevant equations

    3. The attempt at a solution
    I already had this typed in word so here is a screen shot:

    I don't understand why the negative is omitted in the "correct answer" "B." In solving this problem I wanted to proceed in finding the image location relative to the first lens, which should be 9.2 cm.
  2. jcsd
  3. Jul 31, 2016 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    The diagram does not define the axes so the sign is arbitrary.
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