Light ?does bend in a gravitational field. Why is this bending not taken into consideration by surveyors who use laser beams as straight lines?
ANSWER: Even light has no mass, it does bend by the gravitational fields. As we know that Newtonian mechanics is a special case for general relativity, the force law of Newton which contains the masses of two objects, breaks down. Where general relativity accounts all these things and tells us that even light is mass-less, it gets attracted by gravity and bends near heavy objects like black holes. Coming to the question, laser light is a monochromatic source of light and they are extremely coherent too. As the bending will not be significant, if the object which will bend the light does not contain enough mass, it’s very hard to observe such phenomena. But, laser light also bends by gravitational field, but it requires very precise instruments to observe the bending.