Eli5: Does a photon really act different by looking at it? How does it know it’s being observed?

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Eli5: Does a photon really act different by looking at it? How does it know it’s being observed?

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Imagine a billiard table is a field, and billiard balls are photons. The only manner you have of detecting photons is by hitting the cue ball. If you hear the strike of cue ball on billiard ball, you have detected a photon. And the photon’s trajectory has been affected.

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