I have read somewhere that one of the tests of the inverse square law is to assume nonzero mass for photon and then, by finding a maximum limit for it , determine a maximum possible error in $\frac{1}{r^{2+\epsilon} }$ for $\epsilon$ . My question is: (in the context of classical physics)
How are these two related and what is the formula relating them?
Why measuring photon mass is easier than testing the inverse square law directly? (Indeed it seems more challenging!)
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