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A method to solve certain differential equations on a domain by putting image sources outside the domain to fulfill [boundary-conditions] on the boundary. Common applications can be found in [electrostatics], [magnetostatics] or [acoustics].

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What is the justification for the method of images in electrostatics?

The answers given so far are very good, but I want to add something that might help. The method of images begin by trying to derive Coulomb's law. Coulomb's law is the Green's function of the Laplace …
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