A Michelson interferometer is used to measure the thickness of a thin film with light of wavelength 560 nm. If the introduction of the film into one of the arms of the interferometer causes a change in the interference pattern by exactly 79 bright fringes, what is the thickness of the film? The film’s index of refraction is 1.39.
A. 56.0 microns
B. 113 microns
C. 56.7 microns
D. 112 microns
E. 15.9 microns
F. 15.7 microns
C. 56.7 microns
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