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What is the speed of a photon falling in a black hole?
How does the gravitational force in a black hole affect the speed of light?
Gravitational force in a black hole is so strong that it curves the spacetime around it. Due to this, the path of a photon changes, and it ends up moving in a curved path instead of a straight line. However, the speed of a photon remains constant despite the curvature of spacetime.