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Homework Help: Reflecting image in a lens

  1. Dec 3, 2009 #1
    1. The problem statement, all variables and given/known data

    An object is 1.75 m to the left of a lens of focal length 0.62 m. A second lens of focal length -2.7 m is 0.52 m to the right of the first lens. Find the distance between the object and the final image formed by the second lens.

    2. Relevant equations

    (1/x1)+(1/image)= (1/focal point 1)

    (1/x2 - image) + (1/x3)= (1/focal point 2)

    3. The attempt at a solution

    i use
    focal 1 = .62
    solve for image in first equation

    then use

    focal 2 = -2.7
    use the second equation and solve for x3
    and get .526 m
    i think im following the steps right, but keep getting the wrong answer. any help would be great
  2. jcsd
  3. Dec 3, 2009 #2


    User Avatar
    Homework Helper

    In the problem xq1 is 1.75.
    What is image distance?
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