If light has no mass, how does gravitational force bend light inwards

Question

In the case of black holes, lights are pulled into by great gravitational force exerted by the dying stars (which forms into a black hole). If light has no mass, how is light affected by gravity?

In: 784

Answer 1

Light (photons) have no *rest mass*, but they do have energy. They are affected by gravity as if they had mass equivalent to their energy (because they *do*), according to the famous E=mc^(2).