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Distance between m=0/m=1 bright fringes

  1. Aug 10, 2008 #1
    1. The problem statement, all variables and given/known data
    Two slits separated by 2.00x10^-5 are illuminated by light of wavelength 500nm. If the scree is 8.0m from the slits what is the distance between m = 0 and m=1 bright fringes?
    answer is 10 cm

    2. Relevant equations
    d=m*lambda*L/y (for the short cute..for small angles)

    3. The attempt at a solution
    at m=0 d=0

    at m=1
    d=1*(500*10^-9)(8.0 m)/(2.0*10^-5) = 0.2m

    so I am getting double...but I can't find a reason t multiply it by 1/2 ...

    please help!!!

    also, do i alway use m for bright fringe and (m+1/2) for dark...?
  2. jcsd
  3. Aug 10, 2008 #2
    I figured out there was a mistake on the answer sheet and the answer is 20 cm

    haha thanks anyways
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