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Normal lines

  1. Sep 1, 2013 #1
    1. The problem statement, all variables and given/known data
    In "Methods of theoretical physics" from the authors Morse and Feshbach is writen:
    " The displacement (dx,dy,dz) is perpendicular to the surface if the component displacemetn satisfy the equation:


    How to prove this relation?

    2. Relevant equations
    the relevant equation is the equation of total change

    3. The attempt at a solution
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Sep 1, 2013 #2


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    hi arbri! welcome to pf! :smile:
    that's just (dx,dy,dx)·∇ψ = 0 :wink:
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