Fringes of 1.8*10^-4m thickness are produced by Fresnel's biprism in th focal plane of a microscope which is placed 1.0m from the slit. A lens inserted between the biprism and the microscopes give the images of the slit in two positions. In one case the two images of the slit are 4.05mm and in the second case 2.90mm apart. Find the phase difference and the path difference corresponding to the 7th bright band and the 11th bright band respectively.
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