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Double Slit

  1. Apr 5, 2009 #1
    1. The problem statement, all variables and given/known data

    a)Yellow light Lambda= 589nm falls on a double slit. The distance between two slits is d=0.5 mm the width of each slit is a=100 micrometer. A screen showing the interference pattern is located 4 m behind the slits.

    2. Relevant equations

    What is the distance between the first and the second maximum on the screen ?

    3. The attempt at a solution

    To calculate the distance

    tan theta1 = X1 / L
    tan theta2 = X2/ L

    X2 - X1 = is the answer ?

    Is this right ? If it is , how can i calculate theta1 and theta2 ?
  2. jcsd
  3. Apr 5, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Where your textbook discusses the double slit there should be an equation, either for intensity as a function of angle OR the angles of the maxima (1st, 2nd, etc.)
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