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: Diffraction grating with combination light

  1. Oct 3, 2013 #1
    Green and orange light pass through a diffraction grating that contains 6000 lines/cm. Compare the appearance of the fringe at m = 0 with all the others.

    So far I've only dealt with light with one wavelength, so I just want to make sure I have the right thought process here for two wavelengths.

    Where m = 0 there is no diffraction, so we should see a combination of green and orange light there, while the other fringes will be either green or orange. With one wavelength, the intensity of all of the fringes is the same (if I'm not mistaken). With two wavelengths, the central maximum will have twice the intensity as the others, because it have 2 wavelengths striking it instead of 1. Then with 3 wavelengths, the central maximum will have three times the intensity, and so on.

    Do I have the right idea here?
  2. jcsd
  3. Oct 3, 2013 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    That's the right way to go - it's the superposition principle.
    You have not been told the relative intensities of the green and orange light though.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted