K7ITM wrote:
On Mar 5, 1:27 pm, Cecil Moore wrote:
The rules change between non-coherent,
non-interfering sources and coherent, interfering sources.

And exactly which part of "linear system" do you fail to understand?

When two equal amplitude coherent signals are superposed,
the resulting power density can be four times the power
density of one of the single waves due to constructive
interference.

That is not true for two equal amplitude non-coherent
waves of different frequencies. The interference term
averages out to zero so there are no bright rings and
dark rings.

I'm surprised you don't know that.
--
73, Cecil http://www.w5dxp.com