Mr. Ruhr said: "It's just that Poisson mathematics is very good. One day someone gave him a paper, saying that light is fluctuating."

"After careful analysis, he deduced according to the other party's theory and formula. If the light wave theory is correct, then the light hits a circular board, and as a result, there will be bright spots in the center of the shadow."

"This is completely contrary to the common sense concept. After all, we all know that there is no light in the center of the shadow, and the light is also

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