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The interference of light and diffraction

  1. May 20, 2015 #1
    1. The problem statement, all variables and given/known data
    In terms of the wavelength of the light λ, what is the value for the path difference x = r1 – r2 if at the point P on the screen there is:

    a. a dark region (and no other dark region between O and P)?

    b. a bright region, with one other bright region between O and P?

    2. Relevant equations
    x = Δr = d sinƟ

    3. The attempt at a solution
    I don't understand this at all? could someone give me a pointer to begin with please, thanks!
  2. jcsd
  3. May 20, 2015 #2
    okay i think for part B, Δr= 2λ ? could someone confirm if this is correct or incorrect?? thanks!
  4. May 20, 2015 #3


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