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Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly

$\begin{array}{1 1} (1)1.25\\ (2) 1.59 \\ (3)1.69 \\ (4) 1.78 \end{array}$