Art Unwin wrote:
There is a big
difference between cancellation and destruction the latter does not
exist per Newton. You can put that in a book and call it revision 2.

Maybe these web pages can "shed some light" on this subject.:-)

www.mellesgriot.com/products/optics/oc_2_1.htm

micro.magnet.fsu.edu/primer/java/scienceopticsu/interference/waveinteractions/index.html

When field/wave cancellation occurs, the energy must go somewhere.
In the absence of a load to dissipate it, the FSU web page says it
is "redistributed to regions that permit constructive interference".

If the relative phases of the two superposed fields are greater
than 90 degrees to 180 degrees apart, the resulting interference
is destructive.

If the relative phases of the two superposed fields are less
than 90 degrees, the resulting interference is constructive.
--
73, Cecil http://www.w5dxp.com
"According to the general theory of relativity,
space without ether is unthinkable." Albert Einstein