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When a mica sheet of thickness 7 microns...

When a mica sheet of thickness 7 microns and `mu=1.6` is placed in the path of one of interfering beams in the biprism expriment then the central fringe gets at the position of seventh bright fringe. What is the wavelength of light used?

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`lamda=((mu-1)t)/(n)=((1.6-1)7xx10^(-6))/(7)=6xx10^(-7)`meter
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