Jim Kelley wrote:
The relation is useful for precisely the reason I indicated. That is
why Heckt also includes it in his book.

Your Freudian slip concerning your feelings about Hecht
is more than apparent, i.e. "To Heck with Hecht"! :-)

One wonders why you said something to the effect that
Hecht had been discredited in favor of Born and Wolf.
When I recommended the 57 page chapter on interference
in "Optics", by Hecht, you said something to the effect
that interference is unimportant, yet Born and Wolf's
chapter on interference is 113 pages long and mostly
agrees with Hecht's writings.
--
73, Cecil http://www.w5dxp.com