In a Michelson interferometer experiment, light from a 630 nm wavelength laser is split by a beamsplitter into two beams and then sent to two different mirrors. One mirror is fixed, while the other is moveable. The mirrors reflect the light back to the beamsplitter where the beams recombine and are incident on a screen. There is constructive interference in the middle of the screen. If the mirror is then adjusted until there's destructive interference in the middle of the screen, how much did the mirror move? (answer in nanometers)

In a Michelson interferometer experiment, light from a 630 nm wavelength laser is split by a beamsplitter into two beams and then sent to two different mirrors. One mirror is fixed, while the other is moveable. The mirrors reflect the light back to the beamsplitter where the beams recombine and are incident on a screen. There is constructive interference in the middle of the screen. If the mirror is then adjusted until there's destructive interference in the middle of the screen, how much did the mirror move? (answer in nanometers)