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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

    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.
  2. jcsd
  3. May 24, 2008 #2
    It is the radius.
  4. May 24, 2008 #3
    I'm thinking it's probably the latter..
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