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Homework Help: Light wavelength passing through a grating sketch help!

  1. Aug 28, 2012 #1
    1. The problem statement, all variables and given/known data

    light with a wavelength of 520 nm abd 630 nm passes through a diffraction grating that contains 6000 lines/cm.

    a) sketch a diagram of the image produced from m=0 to m=2, label the order of each fringe

    b) calculate the angles for the first and second order maxima that would appear on the screen
    2. Relevant equations

    3. The attempt at a solution
    ok so i have no idea how to make this diagram up, and i feel if i get help with that then part b will become easier for me
  2. jcsd
  3. Aug 28, 2012 #2
    In some ways part (b) is the easy bit... all you need is the equation for adiffraction grating:
    dSinθ = nλ so you can calculate the angular postion (θ) of the maxima.
    What you have to watch out for is d = line separation and you have been give Number of lines per cm.
    Once you have the angles for the n=1 and n=2 max for each wavelength you should be able to do a sketch showing their positions.
    hope this will help you
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