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Gravitational lens without acceleratingAs known, in the theory GR the acceleration and gravity are mentioned at identical meaning. And a light has a curved path in an accelerating elevator cabinet according to GR mentality; and this event is called "gravitational lens". However if the cabinet has fixed speed (acceleration = 0) the light will has an inclined path instead of curved path in accordance with same GR mentality.Please look at the figure.
There is another way to create a gravitational lens affect and apparent Doppler shifts, without acceleration or even motion.
Doppler shifts can be caused by gravitational forces