Light Beam Bending by Mass: Equation & Explanation

[squirrlmcduckles]

What is the equation for how a light beam is bent by a mass?
Say a mass M way out in space, and a light beam is aimed from VERY far away such that it should pass at a radius R from the mass.

 

[JBA]

See the following for a discussion of gravitational lensing: https://www.astro.umd.edu/~miller/teaching/astr422/lecture13.pdf

 

[squirrlmcduckles]

See the following for a discussion of gravitational lensing: https://www.astro.umd.edu/~miller/teaching/astr422/lecture13.pdf

Thank you! Thats perfect!