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If two things pass through one another, it simply means they don't interact, or they interact very weakly. In many ways, this is the "natural" state of affairs: we only tend to think no two things can pass through each other because of the strong interactions between what makes up our everyday world. People, walls and chairs are made of stuff that interacts ...


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if for example a light beam coming from a single point of a galaxy, of a single wavelength, crashes with another wave coming from a different direction and angle, with a different wavelength, how is that they just pass one another and continue as if nothing has happen? In classical electrodynamics, where we treat light as electromagnetic waves that ...


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Your first question can be explained by the classical laws of electromagnetism. Classically, electric fields can be in a superposition where they either add or subtract. This means that waves which criss cross do in fact interact in the sense that they add up to a point of constructive or destructive interference in that region. For your second question ...



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