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Quick Optics Question on Gratings (Small calculation)

  1. Jan 21, 2008 #1

    Well, just a quick question, if a grating had 3,000 slits per mm, what would the distance between groves be? Is it 1mm/3,000 which would give me the grove distance?
  2. jcsd
  3. Jan 21, 2008 #2
    So 1/3000 = 3.33x10^-4 is the distance between gooves?
  4. Jan 21, 2008 #3

    Doc Al

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    Staff: Mentor

    Sounds right to me.

    In mm.
  5. Jan 21, 2008 #4
    ^ When using using the formula [tex]n \lambda = d \sin(\theta)[/tex] trying to find the wavelength would I use it in mm?

    I've basically conducted an experiment, using a sodium lamp and spectrometer, and want to see how accurate it is by comparing my results with an online result, but am having trouble finding a source that tells me the wavelengths, that I can compare to with my results.
  6. Jan 21, 2008 #5

    Doc Al

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    Staff: Mentor

    When using that formula, the wavelength will have whatever units "d" has. You can always convert it to more convenient units, such as nm.

    This might help: Sodium Spectrum
  7. Jan 21, 2008 #6
    I swear I saw a blue line aswell though? For the orange line i got 5.7x10^-5 mm, i dont know hwo accurate that is.
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