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[" 23.A microscope is focussed "rho" n a...

[" 23.A microscope is focussed "rho" n a mark on a piece of paper "],[" and then a slab of glass of thickness "3cm" and refractive "],[" index "1.5" is placed over the mark.How should be "],[" microscope moved to get the mark in focus again "],[" (I) "1cm" downward "],[" (3) "1cm" upward "]

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