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

Because the blackhole doesnt do anything to the light, it does it to the spacetime around it. From the lights point of view its still going in a straight line even thou its in orbit around the blackhole within its event horizon.