1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electromagnetic transverse wave question

  1. Jan 21, 2010 #1
    Hello. I'm having some difficulty with a question from Optics (4th edition, Hecht).
    http://milicioner.hit.bg/newphysicsquestion.GIF
    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

    vela

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook