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Archived Spectrometer CCD

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  1. Dec 2, 2013 #1
    1. The problem statement, all variables and given/known data
    A spectroscopist has a spectrometer equipped with a grating with 600 grooves/mm. This grating puts a 1228 nm wavelength range on a spectroscopic plate (a CCD) in order m = 5. The spectroscopist now changes the spectroscopic plate CCD by one that is larger by a factor of 3. What spectral range will be accepted when the spectroscopist observes the lines in order m = 4 with the new, larger spectroscopic plate?

    λ1=1228
    d= 1666.67
    m1=5
    m2=4
    λ2=?

    2. Relevant equations

    mλ=dsinθ


    3. The attempt at a solution

    sinθ=[(5)(1228)]/(1666.67)=3.68

    However I can't solve for θ, and plug it into another question for m2=4. What step should I do next?

    So what exactly does the electroscopic plate do?
     
    Last edited: Dec 2, 2013
  2. jcsd
  3. Mar 3, 2016 #2
    i think the first set of data gives you an idea of angle at which the experiment is being done - my guess is that angle of diffraction gives you size of CCD detector.
    if you use a larger size you may get a larger coverage of wave length /order of diffraction.
     
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