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!

Fraunhofer Diffraction Doubt

  1. Nov 13, 2014 #1
    1. The problem statement, all variables and given/known data
    A monochromatic source of light 'S' is placed at the principal focus of a convex lens 'L1'. A parallel beam of light or a plane wave front is incident on the narrow slit represented by AB (its width - 'a')

    2. Relevant equations
    So, what my teacher did was,
    She showed diffraction of the light rays as they pass through the slit.
    And then she made the rays to meet at a point 'P'.
    Look at the image. Doesn't the convex lens L2 seem to be actually 'diverging' the rays? Shouldn't it 'converge' them?
    I'm literally confused about it, because all the books seem to support my teacher. singleslitexpt.png
     
  2. jcsd
  3. Nov 13, 2014 #2

    dlgoff

    User Avatar
    Science Advisor
    Gold Member

  4. Nov 13, 2014 #3
    Yes the parallel rays are converging. They were parallel and are now drawing together.
     
  5. Nov 14, 2014 #4
    Does it mean why my teacher did was wrong?
     
  6. Nov 14, 2014 #5
    I 'm talking about the second lens...
     
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: Fraunhofer Diffraction Doubt
Loading...