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# A thin film of glass ( $n=1.50$ ) floats on a liquid of $n=1.35$ and is illuminated by light of $\lambda=580 \mathrm{~nm}$ incident from air above it. Find the minimum thickness of the glass, other than zero, that will produce destructive interference in the reflected light.

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In this problem, a thin film of glass float on a liquid. The index of refraction of glass is $n_{1} = 1.50$, while the index of refraction of the liquis is $n_{2} = 1.35$. The incident light has wavelength $\lambda = 580~\mathrm{nm}$. We calculate the minimum thickness of the glass that produces destructive interference.

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