1. Not finding help here? Sign up for a free 30min 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!

Point Source HELP

  1. Mar 30, 2008 #1
    Point Source...HELP!!!

    1. The problem statement, all variables and given/known data
    A point source of light illuminates an aperture 2.3 m away. A 10.2-cm-wide bright patch of light appears on a screen 1.02 m behind the aperture. How wide is the aperture?

    2. Relevant equations

    3. The attempt at a solution
    This looks like a geometry problem but I am not seeing it??
  2. jcsd
  3. Mar 31, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    I have included a drawing of the situation in the attachment.
    You can use the blue triangle to find the angle [itex]\alpha[/itex].
    Then use standard trigonometry to find the answer (which is the length of one of the sides of the red triangle).

    Attached Files:

  4. Mar 31, 2008 #3
    wow thank you very much!!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?