A layer of oil with a refractive index of 140798 097483 mm, Ask an Expert

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A layer of oil, with a refractive index of 1.40798, 0.97483 mm thick, floats on water. Light of vacuum wavelength 632.800 nm, emitted by a stabilized He-Ne laser, is reflected at normal incidence by the oil. How many wavelengths are contained in the light wave passing back and forth through the oil?

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