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!

Constructive & destructive interference of light waves

  1. Oct 26, 2011 #1
    1. The problem statement, all variables and given/known data
    A glass-plate of 350 nm thickness is free standing in space. At the angle of 75 degrees, relative to the glass-plate plane, a white light point-source is placed. The diffraction (probably a typo, and should really be refraction) index of the glass is 1.33. On the same side as the light source, a screen is placed, allowing the observation of the reflections from the glass-plate.
    Derive, explicitly, the conditions for the observation of constructive and destructive interference on the screen.


    2. Relevant equations
    I really have no idea, other than; that Snell's law should probably come into it at some stage.


    3. The attempt at a solution
    I drew a diagram, and I used Snell's law to work out the angle of refraction. I sat still for half an hour, reading the question over and over, trying to figure out what interference had to do with anything in the question.
    I really just need to know, where to start. I have no idea how to begin to attempt this question
     
  2. jcsd
  3. Oct 26, 2011 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Do you think the 350 nm specification might have anything to do with it? Could there be reflections from more than one surface?
     
  4. Oct 27, 2011 #3
    Well, this is just the first part of the question.

    Oh yeah, reflections from more than one surface. That's a lot of help actually. Thanks.
    I'd ask for more hints, but I have to go hand it in now.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Constructive & destructive interference of light waves
  1. Wave interference (Replies: 2)

Loading...