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Homework Help: 'double slit experiment problem' please help

  1. Apr 25, 2010 #1
    1. The problem statement, all variables and given/known data

    q. when the width of both slits in double slit experiment is increased or decreased what happens to:
    1. seperation of fringes
    2. brightness of light fringes
    3. brightness of dark fringes

    and why?

    2. Relevant equations

    3. The attempt at a solution
    couldnt think of any thing
  2. jcsd
  3. Apr 25, 2010 #2


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    Homework Helper

    Do you know the formula sin(theta)=n*lambda/d? You should be able to answer 2 and 3 just by thinking about what happens if the slit width is made very large.
  4. Apr 25, 2010 #3
    i know the equation but it does not deal with the WIDTH of the slits instead it deals with the SLIT SEPERATION.
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