A cubical vessel has opaque walls An observer dark circle in figure below is located such that she can see only the wall CD but

Question

A cubical vessel has opaque walls An observer dark circle in figure below is located such that she can see only the wall CD but not the bottom Nearly to what height should water be poured so that she car see an object placed at the bottom at a distance of 10 cm from the corner c Refractive index of water 1 33 a 10 cm b 16 cm c 27 cm d 45 cm A B ID C

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