How much water should be filled in container 21 cm in height, so that it appears half filled whe...

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How much water should be filled in container 21 cm in height, so that it appears half filled when viewed from the top of the container? (Given that μwa=4/3 ).
a. 8 cm
b. 10.5 cm
c. 12 cm
d. None of the above
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