Can we prove experimentally that light can travel faster than c in void?

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Fernando Soares Schlindwein

No.

Aparna Sathya Murthy

As far as I understand analytically c=1/sqrt(permeability * permittivity) of the material , that is fixed for free space (or ether or void)

Bruno Martin

Could you please remove the C++ tag from your question! It's misleading and make people really trying to help on C++ questions lose their time...