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Optics questions help please

  1. Nov 25, 2012 #1
    1. The problem statement, all variables and given/known data
    An object is 1.2m below the surface of a pool. By using a ray that leaves the object at 5 degrees to the normal, find the apparent depth of the object. Assume the image is located on the normal


    2. Relevant equations

    1/p+1/q=1/f

    n1sintheta=n2sintheta2

    3. The attempt at a solution

    I have no idea how to approach this question all I need is a start then ill solve it.

    The answer is 0.9m but I have no idea how to get there.
     
  2. jcsd
  3. Nov 25, 2012 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    hi link107! :smile:

    they suggest 5° because the result will be the same no matter what angle you choose, provided it's small enough so that tan is approximately the same as sin :wink:

    so just draw a ray :smile:
     
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