Einstein may be wrong about how mirrors travelling at light speed work

A century ago, Albert Einstein discovered a paradox during a thought experiment involving mirrors moving at the speed of light. Now, a new set of calculations has opened it up.

If you search the internet for ‘What would you see in a mirror moving at the speed of light?’ You will find heated discussions on physics related forums. Surprisingly, none of the proposed answers are correct,” says Sergei Bolanov At the facility of ELI Beamlines…