A question i have about light?

Of course!

If somehow you were able to manipulate light, for example by using gravity, it will by definition be subject also to a centripetal force.

For light to be affected at all by gravity suggests there must be an element of mass associated with it for gravity only influences matter. Therefore that very tiny amout of equivalent mass associate with that beam of light will also be subject to centripetal force.

Light is not affected by a centripal force.... As light travels in straight lines and so would not be affected by any kind of tether.... The way in which light is affected by gravity is that it's velocity is affected from the gravitational acceleration and it will bend slightly closer towards the gravitational body which is attracting it...

not too sure about that..

but remember light moves generally in straight lines, and it would not be circular in motion.

it may refract, but it will not move in a circular direction.

considering that, i don't think it would be affected by centripetal force.

Not gravity but mass.And you're right if speed very big.