What happens with the central spot when a liquid of refractive index mu greater than the that of lens and less than that of glass plate is introduced between the lens and the glass plate
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What will happen to the observed Newton's rings if a drop of water is introduced between the glass plate and the lens? The same interference pattern(newton's ring) will be observed as in the case of air medium. But the path difference is not simply 2t, it is 2nt, where n =1.333 which is the refractive index of water.
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