Quote: light appears to reflect from one point of a mirror because that is where many possible paths take nearly equal time

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Although you might think that the parts of … goes from the source to the detector, let … occurs is the square of the final arrow … [i.e., its phase and magnitude] for each way the event could happen, and then combining … In this experiment, there are millions of ways … [p. 45] So where is the part of the … all pointing in nearly the same direction-- because … where the time is least.   Google-1   Google-2

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Quote: quantum mechanics: determine the probability of an event by squaring the sum of the arrows for each way an event could happen

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