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Lens Question I Think

  1. Sep 21, 2008 #1
    1. The problem statement, all variables and given/known data

    A 15-mm-thick layer of water (n = 1.33) floats on a 60-mm-thick layer of carbon tetrachloride (n = 1.46) in a tank. A penny lies at the bottom of the tank. At what depth below the top water surface do you perceive the penny? (Hint: Use the result and assumptions of Problem 21 and work with a ray diagram of the situation.)

    How do I get started? DO I find the focal length?
  2. jcsd
  3. Sep 21, 2008 #2


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    Have you tried following the hint? Please post what you have attempted so far.
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