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A glass plate (n = 1.60) is covered with a thin, uniform layer of oil (n...

A glass plate (n = 1.60) is covered with a thin, uniform layer of oil (n = 1.27). A light beam of variable wavelength from air is incident normally on the oil surface. Observation of the reflected beam shows constructive interference at 677 nm. Determine the minimum non-zero thickness of the oil film.

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