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: Need help understanding ray optics question

  1. Jul 22, 2015 #1
    1. The problem statement, all variables and given/known data
    2. The attempt at a solution
    why is the answer C? shouldn't the aperture in front of the screen create a shadow that blocks all the light except the rays that go through slit? (the width of the slit is >>>1mm so it won't make a diffraction pattern.)
  2. jcsd
  3. Jul 22, 2015 #2
    You will get diffraction through the slit but no interference pattern because the light is not coherent.
  4. Jul 24, 2015 #3


    User Avatar
    Homework Helper

    The answer is C , BECAUSE the aperature blocks all light except the (straight, essentially not diffracted) rays that pass thru the slit.
    Did you notice that the lamp bulb was horizontally long (rather than tall)?
    [that is, what would a "point source" look like on the screen? ...]
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted