A travelling microscope is focussed on a mark made on a paper. When a slab of `1.45cm` thickness is placed on the marl, the microscope has to be raise
A travelling microscope is focussed on a mark made on a paper. When a slab of `1.45cm` thickness is placed on the marl, the microscope has to be raised through 0.49 cm to focus the mark again. Calculate the refractive index of glass.
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