Question

if light has no mass then why it get affected by gravity.

Answer 1

Newton third that only objects with mass could produce a gravitational force on each other according to Newton's theory the force of gravity should not affect light Einstein discovered that the situation is a bit more complicated than that first discovered that gravity is produced by a covered space

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Answer 2

While light doesn't have rest-mass, it still has energy --- and is thus affected by gravity. If you think of gravity as a distortion in space-time (a la general relativity), it doesn't matter what the secondary object is. As long as it exists, gravity affects it.