A layer of oil with a refractive index of 140798 105618, Ask an Expert

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A layer of oil, with a refractive index of 1.40798, 1.05618 millimeter thick, floats on water.

(a) Light of vacuum wavelength 632.800 nanometer, emitted by a stabilized He-Ne laser is reflected at normal incidence by the oil. Obtain how many wavelengths are contained in the light wave passing back and forth through the oil?

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