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Light interference

  1. Nov 2, 2016 #1
    1. The problem statement, all variables and given/known data
    3229489409_600485485_574_574.jpg

    Find condition of d that constructive interference occurs
    with m=1,2,3,...
    a)##(m-\frac{1}{2})\frac{\lambda}{2}##
    b)##m\frac{\lambda}{2}##
    c)##(m-\frac{1}{2})\lambda##
    d)##m\lambda##
    2. Relevant equations
    optical path difference (OPD) must equal ##m\lambda##
    3. The attempt at a solution
    The optical path difference i finded is:
    $$2d+\frac{\lambda}{2}=m\lambda$$
    So ##d=(m-\frac{1}{2})\frac{\lambda}{2}## and I choose A
    But the answer is B)## d=m\lambda##
    Where is wrong?
    Thanks for helping
     
  2. jcsd
  3. Nov 2, 2016 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Your work looks correct to me. I also think (a) is the right answer.
     
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