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A mark is made on the bottom of a vessel...

A mark is made on the bottom of a vessel and over this mark, a glass slab to thickness `3.5 cm` and refractive index `(7)/(4)` is placed. Now water (refractive inidex, `(4)/(3))` is poured into the vessel so that the surface of water is `8 cm` above the upper surface of the slab. Looking down of normally through the water, the apparent depth of the mark below the surface of water will be `:`

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