On Apr 7, 4:46 pm, Owen Duffy wrote:
Cecil Moore wrote in news:J2ORh.12771$JZ3.7427
@newssvr13.news.prodigy.net:

clipped... a logically developed argument

is the sum of the maximum intensities of the two waves,

Now runs loose on a term ("intensity") not linked the the previous
development.

A term from "Principles of Optics", by Born and Wolf. It was
apparently
replaced by "irradiance" in "Optics", by Hecht. Intensity, irradiance,
and
Poynting vectors are all power densities, joules/sec/unit-area.
--
73, Cecil, w5dxp.com