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Lense with two mediums speed of a fish in an aquarium

  1. Nov 14, 2008 #1
    1. The problem statement, all variables and given/known data
    A goldfish is swimming at 4.40 cm/s toward the front wall of a rectangular aquarium. What is the apparent speed of the fish as measured by an observer looking in from outside the front wall of the tank? The index of refraction of water is 1.333.

    2. Relevant equations
    p = - (n1/n2) q
    where q is object distance, p is image distance, and n1 and n2 are the respective indices of refraction mediums

    3. The attempt at a solution
    i plugged it in using water (1.33) as medium 1 and air (1.00) for n2. I plugged in 4.40 for q. I got 5.85 and that got the red x.... help
  2. jcsd
  3. Nov 14, 2008 #2


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    Homework Helper

    Hi goWlfpack,

    Here p is the object distance and q is the image distance; you seem to have these switched with each other.
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