In principle, we can use it along with the angular equation from the previous section to completely determine the motion of a photon in Schwarzschild spacetime. In practice, however, this is basically...In principle, we can use it along with the angular equation from the previous section to completely determine the motion of a photon in Schwarzschild spacetime. In practice, however, this is basically impossible to do by hand, which means we must either use a computer or use the qualitative effective potential energy technique that we discussed earlier.
