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

According to Newtonian gravity, it can’t. Light has no mass, therefore it isn’t affected by gravity. Newtonian gravity is, however, just an approximation. It turns out that things with no mass *can* be affected by gravity, and that’s what Einstein described in 1915.