Question: A fine metal foil separates one end of two pieces of optically flat glass, as in Fig. 24-33. When light of wavelength 670nm is incident

A fine metal foil separates one end of two pieces of optically flat glass, as in Fig. 24-33. When light of wavelength 670nm is incident normally, 28 dark lines are observed (with one at each end). How thick is the foil?

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