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Homework Help: Apparent depth of water

  1. Oct 3, 2009 #1
    Any help how to approach this problem.

    The depth of pond is 10m. What is the apparent depth for a person looking normally to the water surface? ( Refractive index )water =4/3.
  2. jcsd
  3. Oct 3, 2009 #2


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    Gold Member

    Make an attempt.
  4. Oct 3, 2009 #3
    i solved it by using the forumale (real depth/ apparent depth ) = refractive index

    aparent depth comes out to be 7.5m.

    My problem is how to get the relation
  5. Oct 3, 2009 #4

    Doc Al

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    Staff: Mentor

    Use Snell's law of refraction and a little trig. (Examine the rays emanating from a point source a distance d under the surface. See how those rays refract. Consider small angles directly above the source.)
    Last edited: Oct 3, 2009
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