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W5DXP wrote:
Jim Kelley wrote: Here's a quote from Born and Wolfe, pg. 48, talking about waves encountering the interface between dense and less dense media: "Although there is a field in the second medium, it is easy to see that no energy flows across the boundary. This is just another one of your *NET* energy statements. Actually it's just a quote from an optics book describing, among other things, how a field can cross a boundary without energy necessarily flowing across it. It happens to be the same thing I've been trying to explain to you. I notice you didn't mention anything about photons dematerializing and rematerializing over there. Give that one a try. :-) I did, and no one objected. But we don't need quantum physics to explain HF RF waves. I searched the entire thread. Not one mention of photons dematerializing or rematerializing. Upon what technical point do we still disagree? If the rearward-traveling waves give up their energy to the two waves traveling in the forward direction, the energy has changed direction, by definition. Actually you have it backwards. If energy had been reflected, the forward waves would have given up their energy to the reflected waves. The reflected waves only give up their energy in a sense by not taking it in the first place. There is not enough energy in P1 and P2 to support Pfwd2. Constructive interference energy must be added into Pfwd2. P1 and P2 are the only terms in the equation, Cecil. Obviously they have enough energy to produce the correct answer. But I know what you are getting at, Cecil, and it is interesting. But the example Joseph Legris gave you (the same one I described previously) should illustrate for you the problem with what you are saying. It's apparent from that example that energy from the lasers goes directly to the constructive interference side without having to come from somewhere else (other than the source). And it's also true that that only occurs when destructive interference is also occurring elsewhere. According to Hecht, that constructive interference energy can only originate from destructive interference. What he's saying is that you can't have one without the other. 73, Jim AC6XG |
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