A thin film with an index of refraction of 1.60 is placed in one of the beams of a Michelson interferometer. If this causes a shift of 8 bright fringes in the pattern produced by light of wavelength 580 nm, what is the thickness of the film? A) 1.5 mu m
B) 2.9 mu m
C) 3.9 mu m
D) 7.7 mu m
E) 16 mu m