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Homework Help: Intensity of Electromagnetic Wave

  1. Mar 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Show that intensity of radiation(EM wave) falls off with depth z
    I(z)= Ie^(-2niwz/c)

    where I = initial intensity
    and ni=complex paert of refractive index

    2. Relevant equations
    I have tried the solving the solution using poynting vector.

    I have been pondering over the question over the last two days without any success. I think i am making it more complicated than it needs. to be. I would appreciate it if you point me in the right direction .
  2. jcsd
  3. Mar 12, 2009 #2


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    Homework Helper

    Determine the electric field. You are probably supposed to assume that an EM wave is normally incident on the surface.
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