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A glass sheet is covered by a very thin opaque coating. In the middle of this sheet there is a thin scratch 1.25*10^-3mm thick. The sheet is totally immersed beneath the surface of a liquid. Parallel rays of monochromatic coherent light with wavelength 612nm in air strike the sheet perpendicular to its surface and pass through the scratch. A screen is placed in the liquid a distance of 43.0cm away from the sheet and parallel to it. You observe that the first dakr fringes on either side of the central bright fringe on the scren are 17.5 cm apart.

A) What is the refractive index of the liquid?

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