Question

if photons are massless then why gravity affect them​

Answer 1

Answer:

It seems that a massless particle/wave would have no difficulty escaping the gravity of a black hole, no matter how massive the singularity. Although photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them.

Explanation:

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Answer 2

If photons are massless, how come light are affected to gravity? ... Light has energy and momentum, so it has "m" in this sense. This m is the same thing that appears in General Relativity (or even Newtonian gravity) as the source of gravitational effects. So light is definitely affected by gravity.