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A thin film of soap solution (n = 1.33) has air on either side and is...

A thin film of soap solution (n = 1.33) has air on either side and is illuminated normally with white light. Interference minima are visible in the reflected light only at wavelengths of 320, 360, and 720 nm in air.

1)

What is the minimum thickness of the film? (Express your answer to two significant figures.)

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