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Diffraction hw help

  1. Feb 1, 2008 #1
    [SOLVED] Diffraction hw help

    1. The problem statement, all variables and given/known data

    calculate d for a diffraction grating with 600 lines/mm.

    2. Relevant equations

    mwavelength / d = x/ L

    3. The attempt at a solution

    well i really don't know what to solve for because i thought the diffraction grating is d.
  2. jcsd
  3. Feb 1, 2008 #2
    how would you solve for d?
  4. Feb 1, 2008 #3


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    What is d supposed to be? (what does it represent)
  5. Feb 1, 2008 #4
    d= gap separation
  6. Feb 1, 2008 #5
    or maybe it means put it in terms of m/lines?
  7. Feb 1, 2008 #6


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    Gap separation would be expressed in units of length, right? So if there are 600 lines per mm, how many mm is one line?
  8. Feb 1, 2008 #7
    1.66 * 10-3 mm/Line ? is that right and then can i change it to meters to be 1.66* 10-6 m/line
  9. Feb 1, 2008 #8


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    That's how I would do it. I don't know if you need to convert to meters but there's nothing wrong with that.
  10. Feb 1, 2008 #9
    the portion of the equation x/L is the same as oppostie/hypotenuse so the orginal equation can be written as sin (theda) = m*wavelength / d. Since sin (theda) cannot exeed 1 what is the highest order bright line which can be formed form the 6330 Anstrom (spelling of this unit is probably wrong) laser upon the 600 lines/mm diffraction grating?

    i worked the problem and for the answer i got:
    the 2nd order?
  11. Feb 1, 2008 #10


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    Looks OK to me.
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