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No.of orders of diffraction visible

  1. Oct 28, 2015 #1
    1. The problem statement, all variables and given/known data
    image.jpg

    2. Relevant equations
    dsinθ=nλ

    3. The attempt at a solution
    I chose D, but I can't seem to see why the number of orders changes. There are more lines per metre, so distance between slits decreases, hence sinθ would increase, which means θ increases too. But this would only apply if the number of diffraction orders and the wavelength is the same, according to the formula. Why does the number of diffraction order changes? The answer is B
     
  2. jcsd
  3. Oct 28, 2015 #2
    How many can fit between + pi/2 and - pi/2?
     
  4. Oct 28, 2015 #3
    2d/λ ?
     
  5. Oct 28, 2015 #4
    Ohhh, so as distance between slits, d, reduces, n reduces, ok I got it. Thanks!
     
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