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in the below image,will there be complete destructive interference when s4 is placed in front of s3 and where does that energy go.can it be extracted from the system.


marked as duplicate by Kyle Kanos, Jon Custer, John Rennie quantum-mechanics Jan 30 '17 at 17:04

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    $\begingroup$ You could say that $S3$ was a source of light and $S4$ a perfect absorber of the light from $S3$. $\endgroup$ – Farcher Jan 30 '17 at 8:52
  • $\begingroup$ I don't understand, two sources can form an interference pattern (a sequence of minima and maxima), they do not just cancel out each other globally... $\endgroup$ – MsTais Jan 30 '17 at 15:53