On Sep 11, 10:37*am, Richard Clark wrote:
On Thu, 11 Sep 2008 06:18:14 -0700 (PDT), Art Unwin

wrote:
If I have a flash light that is focussed does this wavelength aproach
still apply?

The reflector (or magnifier lens, take your pick) is on order of at
least 1 centimeter. *The light wavelength is on order of 500
nanometers.

Ratio = 20,000:1

Beam is generally no narrower than 15 degrees. *At a distance of, say,
6 feet, that beam would cover a diameter of 18 inches. *Nothing like a
Lazer (sic) if that is the goal.

73's
Richard Clark, KB7QHC

I see no basis for the inclusion of wavelengths when one is not using
a straight radiator
A straight radiator requires one type of reflector an array that is
condensed to a smaller volume
requires a reflector that is based on the propagation from that
radiator. If propagation flares out
then you can calculate dish size via WL. If propagation is of a
different form then
the dish must be designed accordingly.The important factor as I see
it is the mode of propagation
and what area is required at a distance to account for tha propagation
mode. If one starts with a
lazer then the reflecting surface need not be larger than the
initiating beam area assuming zero scattering.
Your thinking is based solely on the state of the art via reading
matter. You need to go back in physics
to the four forces of the standard model to analyse this question on
the basis of the unification
theory which is all conclusive where one can determine relative
ejection paths from the radiator.
The latter may well gyrate to WL I suppose