Main Question or Discussion Point
is it possible to continuously change the acceleration of light?
then the velocity is always c, so the acceleration is zero.The light is in a vacuum
then the velocity is always c, so the acceleration is zero. /QUOTE]
Hey, olgranpappy. Classically light can accelerate normal to it's trajectory in a gravitational field, but I dont think this answers the intent of the question...
In general, and in a curved spacetime light can vary in velocity with respect to a nonlocal inertial frame, I think. I don't think this was the intent of the question either.
By the way, thanks for the help with the electromagnetism question I had.