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Homework Help: Diffraction Grating wavelengths

  1. Mar 14, 2008 #1
    light wavelengths of 520nm and 630nm passes through a diffraction grating that contains 6000lines/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. c) What is the lowest value of m for which the 520-nm line no longer exists?

    For part b....what wavlength do i use to find the angles for the first and second oreder maxima???....:S
  2. jcsd
  3. Mar 14, 2008 #2
    can anyone help me ...please..
  4. Mar 14, 2008 #3
    They have different angles in both the first and second maxima.
    (10^-2/6000)sintheta =n(520*10^-9)
    sintheta cannot exceed one
    so calculate the n your own

    you should calculate and do homework yourself.
    I am to guide you, not to help u finish your homework
  5. Mar 14, 2008 #4
    this is not my homework..It was my homework...but i got it wrong, unfortunately my teacher did not write the correct answer....as my exam is approching...i am preparing for it. I am doing this course through ilc, ilc tutors are not available right now because of the break, thats why i wanted to know the answer to this question.
    So for part b) i am supposed to find the first and sec order maxima for both wavelengths?......i see now that's why i got it wrong in first place.
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