A tank contains water upto a height of 30 cm and above it an oil up to another 30 cm height. ______ cm shifts in the position of bottom of the tank is observed when viewed from the above. Refractive indices of water and oil are 1.33 and 1.28, respectively.(A) 7.44 (B) 6.46 (C) 14.02 (D) 6.95
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the another height is 6.46
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