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Homework Help: Penetration depth

  1. Sep 20, 2015 #1
    1. The problem statement, all variables and given/known data: Calculate the penetration depth of an evanescent wave undergoing TIR from glass (n = 1.5) to air interface, such that the amplitute is reduced to 1/e times its original value. Wavelength of the incident light is 5000 angstroms and 60 degrees. First make sure that incident angle of 60 degrees produces TIR - the critical angle is less than 60 degrees.

    2. Relevant equations

    3. The attempt at a solution

    I proved that the critical angle is less than 60 degrees. How does that relate to penetration depth and the amplitute of the evenescent wave?
  2. jcsd
  3. Sep 20, 2015 #2
    Try writing down a few of the equations. Drawing a picture can help also.
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