A cubical vessel with opaque walls is so
Ocated that the eye of an observer does not see its
bottom, but sees all of the wall CD (see fig.). What volume of water should be poured into the vessel for the observer to see an object F fixed on the bottom at a distance of 'b' = 10 cm from the corner D ? The face of the vessel is 'a' = 40 cm. ( μ W = 
)
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42.73 litre
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