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.

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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