::::::::: The entry is about physics, not mathematics. The Newtonian "force" equation applies to objects having at least an infinitesimal mass. If light has an infinitesimal mass, then it works fine and there is a deflection. If not, then we would assume the result would be a continuous one, rather than a physical discontinuity. There is no way to demonstrate that light has absolutely no mass, so arguing for a discontinuity here seems particularly pointless. | ::::::::: The entry is about physics, not mathematics. The Newtonian "force" equation applies to objects having at least an infinitesimal mass. If light has an infinitesimal mass, then it works fine and there is a deflection. If not, then we would assume the result would be a continuous one, rather than a physical discontinuity. There is no way to demonstrate that light has absolutely no mass, so arguing for a discontinuity here seems particularly pointless. |