Eli5: Does a photon really act different by looking at it? How does it know it’s being observed?
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Yes but to make it simpler you have to remember that photons correspond to a quantity of energy that is measurable and is not a ball of light flying around. So essentially you are seeing energy. Just like a wave in the ocean which is also energy, a perturbation of the water body. The wave itself does not physically exist but we can see it by its perturbation and measure its properties.
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