if a young's double slits experiment,the fringe width is found to be 4.2mm .if complete apparatus is immersed in a transparent oil of refractive index 1.4, calculate new fringle width
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Explanation: we know that if a light travels a distance of l in vaccum then it travells l/RI in that medium
in formula y=D lambda /d
lambda = l/1.4
therefore new y=4.2/1.4=3mm
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