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Homework Help: Index of refraction in an air bubble

  1. Oct 15, 2009 #1
    [SOLVED] Index of refraction

    1. The problem statement, all variables and given/known data
    An air bubble inside an 9.00 cm-diameter plastic ball is 2.90 cm from the surface.

    As you look at the ball with the bubble turned toward you, how far beneath the surface does the bubble appear to be?

    2. Relevant equations
    n_1/s + n_2/s' = n_2-n_1/R

    3. The attempt at a solution
    1.59/.0290 + 1/s' = 1-1.5/.045

    I'm not sure why that isn't correct.


    1.59/.0290+1/s' = 1.59-1/.045
    s'=.024m <- correct
    Last edited: Oct 15, 2009
  2. jcsd
  3. Oct 15, 2009 #2


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    Homework Helper

    Here s' is virtual. So it should be -ve.
    Your value is correct.
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