Angle deflection from gravitational lenses

  • Thread starter Niles
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  • #1
Niles
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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.
 
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Answers and Replies

  • #2
Ignition
54
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It is the radius.
 
  • #3
astrorob
140
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I'm thinking it's probably the latter..
 

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