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Phase difference after passing through liquid and glass

  1. Feb 19, 2016 #1
    1. The problem statement, all variables and given/known data
    Two waves travel next to each other for 100cm.
    Wave A passes through a glass container containing liquid. The thickness of the glass in total is 1cm and the width of the liquid is 10cm. The glass has n = 1.52 and the liquid has n=1.33.
    Wave B passes through a vacuum and has wavelength 500nm.
    Both waves start out in phase. Find the relative phase differences at the finishing line (after 100cm).

    2. Relevant equations
    c/n = λv (?)

    3. The attempt at a solution
    I'm not sure where to start.
    I was thinking that the phase difference will be proportional to the difference in time it takes to get to the finish line.
    Δφ = Δt
    But I have no idea how to find the difference in the time it takes for each wave to get to the end.
     
  2. jcsd
  3. Feb 19, 2016 #2

    BvU

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    You need to rethink (or look up) your equations. Dimensions don't match in both cases !
     
  4. Feb 19, 2016 #3
    So I found this: Δφ/2π = Δt/vo
    And then t = c/λ and I find the new wavelength for each section of path B with c/nv and then add up the times?
     
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