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 2 cm focus it again. Find the depth of water in the beaker.
(1) 4 cm
(2) 8 cm
(3) 8/7 cm
(4) 8/3 cm
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