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!

White light to different colors

  1. Feb 1, 2013 #1
    Hi

    I have a question, when shining a flash light (white light) we are getting all the visible spectrum of light correct; the wavelengths are under 400 to above 700 nm ? now if we put a red or blue plastic sheet on top of the flash light we see the color of that plastic sheet.

    What is happening to the light? say we put a clear red plastic sheet on the flash light, so the light that is coming out of the other side has a wavelength of 700 - 750 nm ?
     
  2. jcsd
  3. Feb 1, 2013 #2

    I like Serena

    User Avatar
    Homework Helper

    Hi fouad89! :smile:

    I'm afraid a flash light doesn't give all of the visible spectrum of light.
    It only stimulates the 3 types of cones in your eyes to create the illusion of white light.

    If you put a red plastic sheet over the flash light, that plastic sheet will absorb (or reflect) the visible light that is not red, and allow red through (which is 620 nm and up).
    Whether it lets non-visible light through is not known.
    You'd need more information on the plastic to be able to tell.
     
  4. Feb 1, 2013 #3
    ok thanks
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: White light to different colors
  1. White light (Replies: 15)

Loading...