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Slits per cm on diffraction grating

  1. Apr 5, 2009 #1
    1. The problem statement, all variables and given/known data

    Light of 650 nm can be seen in three orders in a particular grating. About how many slits per cm does this grating have?

    2. Relevant equations

    Yikes.

    3. The attempt at a solution

    Either this question is ridiculously hard resulting in me not even having a clue where to start, or it is so easy that I don't even deserve to get it right.. haha. If someone could just point me towards the right CONTINENT, I might have a chance.. heh. Thanks in advance.
     
  2. jcsd
  3. Apr 5, 2009 #2

    Redbelly98

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  4. Apr 5, 2009 #3
    I understand that, but without knowing the length of the grating, how could one possible ascertain slits / cm?
     
  5. Apr 5, 2009 #4

    Redbelly98

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    The equation gives you the distance between adjacent slits. Take the reciprocal of that distance (in cm), and you get the number of slits per cm.
     
  6. Apr 5, 2009 #5
    Got it. Ugh. Too many hours of looking at this screen. Thanks for your time.
     
  7. Apr 5, 2009 #6

    Redbelly98

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    You're welcome, no problem.
     
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