In astronomy, an interferometer can be used to
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A Michelson interferometer is adjusted so that a bright fringe appears on the screen. As one of the mirrors is moved 29.7 µm, 97 bright fringes are counted on the screen. What is the wavelength of the light used in the interferometer?
Suppose you are observing the interference pattern formed by a Michelson interferometer in a laboratory and a joking colleague holds a lit match in the light path of one arm of the interferometer. Will this match have an effect on the interference pattern?
Define a spectrum and discuss how spectra are used in astronomy.