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: Interference pattern, wavelength

  1. May 15, 2009 #1
    1. The problem statement, all variables and given/known data
    Suppose the interference pattern shown in the figure is produced by monochromatic light passing through two slits, with a separation of 127 µm, and onto a screen 1.14 m away. What is the wavelength? 28-34.gif

    2. Relevant equations
    wavelength = (dsin[tex]\theta[/tex]) / m

    3. The attempt at a solution
    [tex]\theta[/tex]= arctan (y/L) = arctan (.023 / 1.4) = .941
    then plugged it in to get wavelenth. i used m = 2 for 2 slits
    wavelenth = 127 x 10^-6m x sin .941 / 2

    i think I have m wrong?
  2. jcsd
  3. May 15, 2009 #2


    User Avatar
    Homework Helper

    i used m = 2 for 2 slits
    m is not the number of slits. It is the order of the fringes starting from m=0 for the central bright fringe.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook