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When to use destructive or constructive equation for young's DS exp.

  1. Mar 26, 2013 #1
    1. The problem statement, all variables and given/known data
    Light of wavelength 646 nm passes through a slit 5.50 × 10^-6 m wide and falls on a screen that is 2.01 m away. What is the distance on the screen from the center of the central bright fringe to the third dark fringe on either side?

    2. Relevant equations
    destructive: (m+1/2)λ=dsin(θ)
    constructive: (m)λ=dsin(θ)
    y=Ltanθ

    3. The attempt at a solution
    You're supposed to use the constructive equation, where m=3. Why don't we use destructive equation? (Since we're interested in the center to dark fringe at m=3)
     
  2. jcsd
  3. Mar 26, 2013 #2

    Simon Bridge

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  4. Mar 26, 2013 #3
    Helpful link! thank you :)
     
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