A Michelson interferometer is used to measure the thickness of a thin film with light of wavelength 560 nm. If the film has index of refraction 1.39, and thickness 56.7 microns, a change in the interference pattern of how many bright fringes will result from the introduction of the film into the interferometer?
A. 281
B. 141
C. 78
D. 79
E. 280
F. 140
D. 79
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