A travelling microscope is focused on to a scratch on the bottom of a beaker.Water of refractive index 4/3 is poured in it.Then the microscope is to be lifted through 2cm focus it again.Find the depth of the water in the beaker.1)8cm 2)4cm 3)8/7cm 4)8/3cm

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2=RD(1-1/u) RD=8cm
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