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A thin film of plastic (n=1.56) is 0.25m...

A thin film of plastic `(n=1.56)` is `0.25mum` thick. It is sandwiched between two glass slabs with refractive indice of `1.58` and `1.52` respectively White light (400-700nm) is first incident normally on the slab for which `n=1.58` Which visible wavelength (in nm) is missing in the reflected light?

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