1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Two slit interference

  1. Dec 3, 2007 #1
    1. The problem statement, all variables and given/known data

    Using a conventional two-slit apparatus with light of wavelength 540 nm, 33 bright fringes per centimeter are observed on a screen 3.8 m away. What is the slit separation?

    2. Relevant equations
    m/x = (2*theta)/wavelength = number of fringes per meter
    interence maxima
    dsin(theta) =m*(wavelength)

    3. The attempt at a solution
    i tried solving for theta then using that value to find slit separation d but i am totally confused.
  2. jcsd
  3. Dec 3, 2007 #2
    i got the answer.
    fringe spacing = ((wavelength)*L)/d
    L = distance to screen
    d = slit separation

    the fringe spacing would be the inverse of 33fringes per cm or ((3300)/m)^-1 then just solve for d
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook