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Homework Help: Why is I(x)= dP/dx*1/A

  1. Nov 28, 2007 #1
    1. The problem statement, all variables and given/known data

    Why is

    I(x)= dP/dx*1/A

    Where x is the wavelenght lambda. P the power, A the area and I the intensity.


    3. The attempt at a solution
    I=P/A is all i know..

    Thanks in advance
     
  2. jcsd
  3. Nov 29, 2007 #2
    Can someone please tell me if this is the anwser:

    I=P/A

    I(x)=P/A (x)

    I(x)= P/(x) * 1/A

    I(x)= dP/dx * 1/A

    The anwser must be something like this, right?
     
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