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Homework Help: Lens (biconvex?) problem

  1. Feb 16, 2009 #1
    1. The problem statement, all variables and given/known data
    An object is 34.0 cm from a screen.

    What are the radii of a symmetric converging plastic lens (i.e., two equally curved surfaces) that will form an image on the screen twice the height of the object? (Take the index of
    refraction of plastic to be 1.59.)

    2. Relevant equations

    (1/f) = (1/s) + (1/s')

    (1/f) = (n-1)[(1/R)-(1/R')]

    3. The attempt at a solution

    I attempted to use those two equations to solve the problem, my answers were 71.5 and 25.2. Both were wrong.

    If anyone can help within the next 1 hour and 30 minutes I would really appreciate it, thank you
  2. jcsd
  3. Feb 16, 2009 #2
    Never mind, I solved it.
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