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Homework Help: Focal distance of lens submerged in water

  1. Aug 10, 2013 #1
    1. The problem statement, all variables and given/known data

    A biconvex lens with radius of curvature 15 cm has a focal length of 15 cm in air. What is its focal length if it is submerged in water (n=1.33)?

    2. Relevant equations

    1/f = (n-1)(1/R1 - 1/R2)

    3. The attempt at a solution

    1/f = 1/0.15 = (n-1)(2/0.15)

    Solving for n gives n = 1.5

    So the new equation will be:

    1/f = (1.5 - 1.33)(2/0.15) = 2.27

    f = 0.44

    What am I doing wrong?
  2. jcsd
  3. Aug 10, 2013 #2
    No. Refer your textbook or notes again.
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