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Homework Help: Double, single slit, and diffraction

  1. May 26, 2010 #1
    1. The problem statement, all variables and given/known data
    Hi guys,
    I'm going through a rough time understanding double and single slit and diffraction.

    Here's the first problem:
    A) A single slit gives destructive interference when m*L=w*sin(theta). A double slit gives constructive interference when m*L=d*sin(theta). Explain the role of d and w for the double and single slit.

    B) A very wide slit is narrowed to zero width. When(at what point)does diffraction start to occur?

    2. Relevant equations
    A) I guess we can just use the above equations to figure out what their roles are.

    B) I was thinking to use a*sin(theta)=m*L

    3. The attempt at a solution

    A) I don't know how to explain and how those two are related to each other

    B) I guess I could say that diffraction starts to occur when a>0, but I'm not sure because it wants a specific point.

    Thank you,
  2. jcsd
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