How is energy conserved during interference of light waves? I already know a textbook explanation that in constructive interference the resulting intensity is four times the initial intensity and for destructive interference it is zero,so the net energy in youngs double split experiment remain constant.But shouldn't energy be conserved in any closed system we consider? We can consider two rays that interfere constructively alone as a system.Also existence of bright fringes does not imply existence of dark fringes, I could add glass pieces over the region of board where destructive interference was supposed to be and prevent destructive interference to an extent and vice versa.Will energy be conserved in such a system?
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1Does this answer your question? Energy conservation and interference – John Rennie May 27 '22 at 05:12
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1Also What happens to the energy when waves perfectly cancel each other? – John Rennie May 27 '22 at 05:13
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Energy is passed to the magnetic field – jensen paull May 27 '22 at 10:01
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What is the clear difference between interference and diffraction? – HolgerFiedler May 28 '22 at 03:02