Well known, that strong gravitational field causes refraction of EMF. But if in vacuum we can determine the boundaries of gravity effect will there be a reflection of electromagnetic wave incident on it? Can we use refraction index of gravitational field in this case?
Malcolm White
No, but light can be sent back the way it came if it goes round the back of a very massive object/deep gravitational well. This is not refraction, but the bending of space.
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André Michaud
Dear Kirill
You use the word "refraction" but if you mean light bending when light is deflected by passing close to a star, like in gravitational lensing, the correct word to be used is "deflection" of light or deflection of photons trajectories if you consider EM energy as being individual photons.
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