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Help with Diffraction

  1. Apr 11, 2007 #1
    A single slit has a width of 1.5 x 10^6 m and is used to form a diffraction pattern. Find the angle that locates the second dark fringe when the wavelength of the light is each of the following.

    (a) 425 nm

    (b) 650 nm


    I answered with (a) 16.46 and (b) 25.68 but these answers are wrong
     
  2. jcsd
  3. Apr 12, 2007 #2

    Päällikkö

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    You're asked for the second dark fringes, which I suppose means n = 2 in the equation
    [tex]d \sin\theta = n\lambda[/tex]
    (you've apparently used n = 1)
     
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