How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that αμω=43
To see the container half-filled from top, water should be filled up to height x so that bottom
of the container should appear to be raised upto height (21-x).
As shown in figure apparent depth h'=(21-x)
Real depth h=x
∴ u=hh′⇒43=x21−x⇒x=12 cm