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Easy question on diffraction of light please help!

  1. May 8, 2008 #1
    [SOLVED] Easy question on diffraction of light please help!

    1. The problem statement, all variables and given/known data
    Wavelengths are; 1 - 520nm
    Wavelength 2 - 520.8nm
    Diffraction grating - 400 lines per mm
    How many orders will the lines be seen in?


    2. Relevant equations
    N = dsin0/lamda


    3. The attempt at a solution

    d = 1/4 X 10^5 = 25 X10^-7m
    25 X 10^-7 / 520 X 10^-9 = 4.8
    So is the answer 4??? for the first wavelength (520nm)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 8, 2008 #2

    G01

    User Avatar
    Homework Helper
    Gold Member

    Your work looks good to me.
     
  4. May 8, 2008 #3
    I got 4.80769, so your math is correct.
     
  5. May 9, 2008 #4
    Thanks - hope its right!
     
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