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Finding the width of a slit

  1. Nov 11, 2009 #1
    1. When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 51.5°. Determine the width of the slit.

    2. sin[tex]\theta[/tex]=[tex]\lambda[/tex]/w

    3. w=450e-9/sin(51.5)=5.75x10-7
    I tried this but it said it was wrong, if anyone could help that would be great.
  2. jcsd
  3. Nov 12, 2009 #2


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    Homework Helper

    In the problem the given angle is the separation dark bands on either side.
    So θ = 51.5/2 degrees.
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