Where do light particles go? If a person is in a dark room, and they open a curtain, light illuminates the room from outside. But then, when the curtain is closed, the room is dark again, and the light is no longer there. Where did it go?
I probably have a flawed understanding of how light particles work.
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The issue is that “particles” is an incomplete description of light. Light photons are waves (ripples of electric and magnetic field) just as much as they are particles.
So your question is kind of like asking “where do waves go when they hit the shore?” Their energy just dissipates.
In the case of light, within a few bounces the photons get absorbed and are turned into heat.
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