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Does light has mass

Does light has mass ?
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There are some theories about mass of photon. But practically you cannot find its mass. just check with a torch light. Do you think the mass of torch decreases upon giving light?
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There are some theories which talk about mass of photon (more precisely those theories and some experimentation have given the limits of mass).

But we have the strongest tool Einstein's relativity which has passed all the tests and can not be wrong.

By that special toll we can say the rest mass of photon is exactly zero.
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If u study light as wave,then it is mass less, if u study it as particle, then its has mass 10^-47kg.
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