A cubical vessel with non transparent walls is so located that the eye E of an observer can not see its bottom but can see all

Question

A cubical vessel with non transparent walls is so located that the eye E of an observer can not see its bottom but can see all of the wall CD The height upto which water should be filled in the vessel for the observer to see an object O as 4 shown will be OC 10 cm of water 3 1 25 cm hipe A ID 2 26 7 cm

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