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Electromagnetic transverse wave question

  1. Jan 21, 2010 #1
    Hello. I'm having some difficulty with a question from Optics (4th edition, Hecht).
    I included the answer in the same image (it is at the end of the book), but I can't understand why (-E/(rsqr2))i must be negative.
    Thank you
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Jan 21, 2010 #2


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    What is the vector pointing along the direction of propagation? Then remember E has to be perpendicular to it because light is a transverse wave.
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