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Einstein Cross/Ring

  1. Sep 20, 2008 #1
    Why do we ever get Einstein crosses? I realise it is because the alignment is not right, but why do we get a cross because of this instead of just a skewed ring?

  2. jcsd
  3. Sep 20, 2008 #2

    George Jones

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    Hartle's book Gravity: An Introduction to Einstein's General Relativity has a nice treatment of this. I can look it up on Monday.
  4. Sep 21, 2008 #3
    That would be great, thank you.
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