Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Complete annihilation of light through polarizers

  1. Feb 13, 2012 #1

    when i am doing an experiment that uses two polarizers (Cross) to achieve complete annihilation of light,

    why am i not able to see complete darkness when i look at the light source from the end of the polarizers, but rather the light source changes to a different color

    for example, if i have a blue light source, i see it become dark blue, but never really black.

    so is there a reason? theoretically i am suppose to kill 100% of the light right?

  2. jcsd
  3. Feb 13, 2012 #2
    The polarizers are imperfect.
  4. Feb 13, 2012 #3
    so its a fault on the experiment apparatus?
  5. Feb 13, 2012 #4


    User Avatar

    Staff: Mentor

    Yes. Perfect polarizers are in the same category as frictionless surfaces.

    You might suggest to the Ideal Scientific Equipment Company that they add perfect polarizers to their catalog. :smile:
  6. Feb 13, 2012 #5
    haha ok thanks!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook