Editing Gravitational Lensing

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**what's the smallest thing we know that causes lensing?
 
**what's the smallest thing we know that causes lensing?
  
*"Do you know anything about Gravitational Lensing? Write down any equation related to lensing." (SR)
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*"Write any equation you can think of related to lensing".  
*How do you determine the magnification of a gravitationally lensed image from the lens equation? (SR)
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*How do you determine the magnification of a gravitationally lensed image from the lens equation.
 
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*How would one calculate the deflection angle of light using GR? (SR)
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*Write down the lens equation. (SR)
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*What is a typical size of an Einstein radius? (RS? SR? I can't remember who asked.)
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*In microlensing, how does one detect a lensing event, given that one does not see a clear Einstein ring?  (SR,MT)
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**How is this effect related to the lensing potential? (SR, MT)
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*Write down the lens equation for an isothermal sphere and a point mass.  What is the Einstein radius?
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** How would you compute the magnification?  How would you do this without any equations? (SR)
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*What is the cross section for a stellar mass lensing event, a planet sized lensing event?  Why do we see planet lensing events?  (SR)
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*What are the observational difficulties of weak lensing measurements? (MT)
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*Why is there a sweet spot for gravitational lenses around redshift .7?
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*What is the Newtonian lensing result and how does it differ from the relativistic result?
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*Are the D's in the formula for the Einstein radius angular diameter distances, luminosity distances, or comoving distances?
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[[Astrophysics]]
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