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

Angle deflection from gravitational lenses

  1. May 24, 2008 #1
    Hi all

    The expression for the angle deflection on the following page: http://relativity.livingreviews.org/open?pubNo=lrr-1998-12&page=node2.html [Broken]

    Is the impact parameter r in the expression the distance to the surface of the objects that deflects the light or the the center of mass of the object? Unfortunately they do not specify this.
     
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. May 24, 2008 #2
    It is the radius.
     
  4. May 24, 2008 #3
    I'm thinking it's probably the latter..
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook