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Now i have not done any further study of physics whatsoever but jarnold's example of a spacecraft simulating an orbit and then actually being in an orbit is flawed as the force of gravity is acting on both the observer and the spacecraft whereas the thrust was only acting on the spacecraft and therefore on the observer as is pressed up against the walls. However if the spacecraft itself was considered to be the observer and it couldn't observe the fact thrusters were functioning or not it could not determine whether is was the thrusters or the gravity that was acting on it.

Back to the original question of how gravity interacts with light i understand by disregarding the statement that objects have energy proportional to their mass according to E=mc^2 and gravity acts weakly on the small energy of the photon just as it would on the "mass energy" of any other object. The difference being that since a photon isnt an object it doesnt have a gravity of its own (the same way waves and particles have some similarities and some differences but interact with one another) to interact back with the black hole thus it loses energy instead

When the photon is losing energy (i suppose an interpretation of this could be that the photon is moving into a more compressed region of space where the speed of light is "faster" relative to the rest of space) the photon isnt traveling at the speed of light anymore and thus can be accelerated back up to 'c' curving it around the black hole. The event horizon represents the point where gravitational interactions with photons cause them to lose all of their "straight line" energy and instead take on a path of orbit, whether sustained or not, around the black hole.

What i am trying to say is that my theory is gravity is a force interacting with energy rather than with mass even the energy which is expanding the universe and thus why space is "curved" towards objects of significant mass.

I might not be thinking multidimensionally enough about the whole subject but that comes from no formal teaching.