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Help me recall an equation

  1. Nov 22, 2009 #1
    Hey all,

    I need to get the equation for the slit width in a double slit interference experiment (not the distance between slits) that depends on the angle theta to the intferference maxima, and any distances involved in the typical setup. I found one on the forum that involves the intensity of the maxima, but I have no way to measure intensity. Any help?
     
  2. jcsd
  3. Nov 24, 2009 #2
    well do you mean fringe width over here..!!if yes then equation goes like this..

    W = (Dλ)/S

    Where,
    W= fringe width
    D=distance from slits to screen
    λ= WAVELENGTH of light
    S=slit seperation(distance between the slits)..

    I hope this is the formula you were looking for.
     
  4. Nov 24, 2009 #3
    Not the fringe width, but the size of the two slits. ie, the size of the larger gaps in the little diagram here.
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