Richard Clark wrote:
W5DXP wrote:
Two waves are flowing with unchanging energies and producing an absolutely
black ring, i.e. zero irradiance equals zero power.

Only when you violate conservation of energy, ...

No violation at all, Richard. The power (irradiance) that is lost
in the black rings is gained in the bright rings as explained in
_Optics_, by Hecht where he says constructive interference is
always equal to destructive interference.
--
73, Cecil http://www.qsl.net/w5dxp



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