Richard Clark wrote:
"Cecil Moore" wrote in message
Pref1 = 198.88mW - 197.51mW = 1.37mW

You've missed the point entirely, the equation above already consigns
1.37mW to total darkness.

No, it doesn't. 1.37mW is the total reflection AFTER ONLY
ONE INTERNAL REFLECTION DURING THE TRANSIENT STATE. The
rest of the reflection is canceled by the subsequent
reflections. The steady-state equation is:

Pref1 = P1 + P2 + 2*sqrt(P1*P2)cos(180)

Pref1 = 111.1 + 111.1 - 2*sqrt(111.1*111.1) = ZERO

P1 = Pfor1*rho^2 = 1000mW*0.1111 = 111.1mW

P2 = Pref2*(1-rho^2) = 125*0.8889 = 111.1mW

Reflections are completely canceled during steady-state!!!
YOU missed the point entirely. I was merely pointing out
the mistake you made when you got 23.32mW after the first
reflection instead of the correct 1.37mW. The interference
during the transient state is not total. The interference
during steady-state is total.
--
73, Cecil http://www.qsl.net/w5dxp

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