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: Light problem

  1. Apr 3, 2005 #1
    The answer to the attachment is 6.04 cm. But the intensity should be zero when the difference in path length is half a wavelength.

    2sqrt(2)x - 2x = 2.5cm

    x = 3.02 cm. However, how come the answer is 6.04cm in stead? Can some one please explain this to me thoroughly? Thanks in advance.
     

    Attached Files:

  2. jcsd
  3. Apr 5, 2005 #2
    can any one explain this? thanks...
     
  4. Apr 7, 2005 #3

    GCT

    User Avatar
    Science Advisor
    Homework Helper

    The overall phase change due to reflection off the mirrors is 180, thus the path difference needs to be the wavelenth, not 1/2.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook