For a Michelson interferometer, the distances of the twoperpendicular mirrors from the beam splitter differ by 1.7 mm. Ifthe interferometer is equipped by a sodium source having n = 589nm, (a) what is the order of the central spot?
(b) Is the central spot dark or bright?
(c) For the 1.7-mm separation between the two mirrors, find theangle of inclination of the observed third bright fringe relativeto the optical axis.
(d) This interferometer is used to measure the difference in thewavelengths of the closely spaced sodium doublet. Two consecutiveinterference patterns are observed after the movable mirror isdisplaced by 0.29 mm. Determine the difference between the twoyellow lines of sodium
