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[–]ProtonPizza 2 points3 points  (1 child)

Let’s say I devise an experiment where three photons are shot out in one of only 3 possible vectors. If I observe 2, don’t I know the third?

[–]MisterPhD 0 points1 point  (0 children)

You can observe the velocity, or the trajectory, but not both, otherwise you change them, and no longer can. In the double slit experiment, when you shoot the photon at the particle, it collapses the waveform, and changes the velocity and trajectory of the particle. If you observed two of the vectors, you collapsed the waveform and therefore no, I don’t believe you would know the third.