1. Not finding help here? Sign up for a free 30min 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!

Width of the slit

  1. Sep 12, 2014 #1
    1. The problem statement, all variables and given/known data
    Monochromatic light of wavelength 550nm is used to illuminate normally a narrow slit. A converging lens of focal length 50cm is used to focus the diffraction pattern onto a screen. If the seperation between the first minima is 10.0mm What is the width of the slit. The ans is 0.055mm.


    2. Relevant equations



    3. The attempt at a solution
    by using formula x= λD/ a ,
    i have 10x10^-3 = (550x10^-9) x ( 50x10^-2) / (a) ,
    i get my a = 0.0275mm ... What's wrong with my working?
     
  2. jcsd
  3. Sep 12, 2014 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Is this formula meant to give the distance between the two first-order minima or is it meant to give the distance between the central maximum and one of the first-order minima?
     
  4. Sep 13, 2014 #3
    I guess the op means the distance between two first min is x ?
     
  5. Sep 13, 2014 #4
    In the working above I assume the x is distance between two first minimum... Anything wrong with it?
     
  6. Sep 13, 2014 #5

    ehild

    User Avatar
    Homework Helper
    Gold Member

    x is the distance of any of the first minima from the central maximum.

    ehild
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Width of the slit
  1. Slit width (Replies: 5)

  2. Width of slit (Replies: 1)

Loading...