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A thin film of soap solution (mu(s)=1.4)...

A thin film of soap solution `(mu_(s)=1.4)` lies on the top of a glass plate `(mu_(g)=1.5)`. When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 420 and 630 nm. The minimum thickness of the soap solution is

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