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Old 12-01-2012, 17:17   #322
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Originally Posted by RayB View Post
Do individual light particles—i.e., photons—have a spin to them?
They "have spin" in the sense that they have quantum angular momentum.

They don't "have spin" in the sense that they're not "spinning."

Turns out that on the quantum level, a thing can have angular momentum even if it doesn't have a physical size.
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