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Another Wave Length question

  1. Nov 23, 2006 #1
    Lights with wavelengths of 520 nm and 630 nm passess through a diffraction grating that contains 6000 lines/cm or 600000 lines/m

    what is the lowest value of m for which the 520 nm line no longer exists?
     
  2. jcsd
  3. Nov 23, 2006 #2
    where do i start with this...
     
  4. Nov 23, 2006 #3

    Kurdt

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    Do you know any equations relating to diffraction gratings?
     
  5. Nov 23, 2006 #4
    sin theta(m) = m(wavelength)/ d
     
  6. Nov 23, 2006 #5

    Kurdt

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    Well all you have to do is find out how many orders you can get for that wavelength. You know when it disappears when [tex] \theta_m [/tex] is greater than 90 degrees.
     
  7. Nov 24, 2006 #6
    thank you very much..
     
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