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Question

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


A
8.0 cm
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B
10.5 cm
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C
12.0 cm
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D
None of the above
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Solution

The correct option is D 12.0 cm

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=hh43=x21xx=12 cm


Physics

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