47.A microscope is focusssed on an ink mark on the top of a table.If we place a glass slab of 3 cm thick on it,how should be the microscope be moved to focus the ink spot again?The refractive index of the glass is1.5

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A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.

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