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## Main Question or Discussion Point

I have a very basic question about wave interference and more specifically electromagnetic wave interference.

Suppose two beams of light each with amplitude A interfere with the same phase. the amplitude of the resulting beam is 2A. the two beams at the start have powers p= [itex]A^{2}[/itex] each. The resulting beam, on the other hand, has a power of 4[itex]A^{2}[/itex]!

Which part of this conclusion is wrong?

Suppose two beams of light each with amplitude A interfere with the same phase. the amplitude of the resulting beam is 2A. the two beams at the start have powers p= [itex]A^{2}[/itex] each. The resulting beam, on the other hand, has a power of 4[itex]A^{2}[/itex]!

Which part of this conclusion is wrong?