0 votes 0 votes When the movable arm of a Michelson interferometer in vacuum $(n=1)$ is moved by $325\: \mu m$ , the number of fringe crossings is $1000$. The wavelength of the laser used in nanometers is ___________________. Others gatein-2021 numerical-answers + – Arjun asked Feb 19, 2021 • edited Mar 5, 2021 by soujanyareddy13 Arjun 2.9k points answer See all 0 reply