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Speed of Light waves

  1. Feb 10, 2014 #1
    1. The problem statement, all variables and given/known data

    A 5.9cm-thick layer of oil (n=1.46) is sandwiched between a 1.3cm -thick sheet of glass and a 2.4cm-thick sheet of polystyrene plastic (n=1.59)

    How long (in ns) does it take light incident perpendicular to the glass to pass through this 9.6cm -thick sandwich?

    2. Relevant equations



    3. The attempt at a solution

    I am very confused to this problem because I am unsure of how to incorporate the length of the different mediums into the equations.
  2. jcsd
  3. Feb 10, 2014 #2
    You only need your first equation to give you v in each medium, as a function of c. Now given the value of the speed of light (which you can express in cm/s), the question is similar to:
    if i walk through a A-meters wide park at B meters/s then across a C-meters wide boulevard at D meters/s, how long did it take me?..
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