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A coating of methylene iodine (index of refraction 1.737) covers a glass plate having a thickness...

A coating of methylene iodine (index of refraction 1.737) covers a glass plate having a thickness of 5.0 cm and which has an index of refraction of 1.50. Light of wavelength 420 nm is incident upon this configuration from near normal incidence. What are the TWO thinnest coatings of methylene iodine which results in the reflected light being the brightest?

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