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When a thin plate of refractive index 1.5 is placed in the path of one of interfering beams of Michaelson Interferometer, a shift of 30 fringes is observed. If the thickness of plate is 0.018 mm, the wavelength of the used light is ____

a) 4000 Å

b) 5000 Å

c) 6000 Å

d) 7000 Å

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