An experimenter detects 251 fringes when the movable mirror in a Michelson interferometer is displaced. The light source used is a sodium lamp, which emits light with a characteristic wavelength of 589 nm. By what distance did the movable mirror move?
What is the distance moved by the traveling mirror of a Michelson interferometer that corresponds to fringes passing by a point of the observation screen? Assume that the interferometer is illuminated with a 606 nm spectral line of krypton-86.
When the traveling mirror of a Michelson interferometer is moved m, exactly 95 fringes pass by a point on the observation screen. What is the wavelength of the light used? Give your answer to three significant figures.