at calibration of the michelson interferometer, the counted number of fringe transitions is 2500, whilst the corresponding translation distance of the movable mirror is produced by rotation over 800 minor drum divisions of the micrometric translation system. the calibration is performed with a laser emitting at wavelength 632.8 nm. what translation distance corresponds to a single minor drum division? provide the answer with four significant figures in units of one micrometer.
