1. The problem statement, all variables and given/known data See Attachment 2. Relevant equations 3. The attempt at a solution So basically I will not bother writing the derivation from my notes but ultimately it turns out an approximation of deflected light around a mass body is [tex]2\delta\phi=4GM/R[/tex] where R is distance of closest approach and M is mass of body. Now what I am confused about is that calculating this deflection angle will give me a value with units of m2s-2, sooooo I should be getting a value with units arcseconds per century, how exactly does this work? Confused the heck out of me. .