Does light have acceleration?

If light has mass surely it should have acceleration but currently I am confused>
Can anyone please tell me.

Answer1:

It can decrease its frequency.

Answer2:

NO LIGHT DO NOT HAVE ACCELERATION....as it has constant velocity of 3,00,000m/s...and no object can be accelerated to reach velocity of light as the mass become infinite to account for increasing kinetic energy of the body when body moves at speed of light.

Answer3:

Theoretically possible, but not practical

Answer4:

No. since It hass a constant velocity in a media.

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