Lynx

Resistance of electron flow is not like classical physical resistance, a resistor doesn't exert a force on the electrons like the word resist seems to imply. It's more like water flow. At a given pressure a given amount of water will flow through a given pipe size. No more or less, only so much can fit. The water isn't 'held back' it simply has no where to go. Light doesn't bend though, it can be reflected and refracted but it always travels in a straight line unless it encounters a physical object. The 'bending' you're referring to in the presence of a gravity field isn't the light bending, it's the space warping causing the perceived path of the light to change. Relativity is funny that way.