It is well known that the method of images is a useful tool for solving electrostatics problems. I was wondering why this technique is not applied when considering newtonian gravity?
Obviously there is no "negative mass" to correspond to a negative charge in electromagnetism, but surely the unphysical nature of negative mass could be ignored and considered a mathematical trick to solve a given problem?
The classic example for the method of images is the point charge near an infinite conducting plane, surely there is a way to apply a similar method to calculate the gravitational field between a point mass and an infinite thin plane?
Some preliminary research online has resulted in no sources on this idea so any references for/against this would be great.