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?

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Answer 1

Gravity is associated with mass. Mass bends spacetime. Light just goes in a straight line through the bent spacetime, and that sends it in what looks like a curve. Just like a “straight line” on the surface of the Earth is a great circle.