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A vesserl contains a slab of glass 8cm t...

A vesserl contains a slab of glass 8cm thick and of refractive index 1.6 . Over the slab, the vessel is filled by oil of refractive index `mu` upto height 4.5 cm and then by another liquid, i.e., water of refractive index `4//3` and height 6cm as shown in Figure. An observer looking down from above observer that a mark at the bottom of glass slab appears to be raised up to a position 6cm from bottom of the slab. Find refractive index of oil `(mu)` .

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