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[" An interference pattern is obtained b...

[" An interference pattern is obtained by "],[" using a Fresnel's biprism.If the fringe "],[" width is "4mm" when air is the "],[" surrounding medium,then the fringe "],[" width if water is the surrounding "],[" medium is "(3n)mm," find "n" .Keeping "],[" the same source.Assume "],[n_(" glass ")=1.5,n_(" water ")=4/3,n_(" air ")=1]

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