What are the two smallest nonzero film thicknesses in nm

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Light of wavelength 615 nm (in vacuum) is incident perpendicularly on a soap film (n = 1.31) suspended in air. What are the two smallest nonzero film thicknesses (in nm) for which reflected light undergoes constructive interference? Let (a) be the smaller of the two values.

Reference no: EM13592973

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