How much water should be filled in a container \( 21 \mathrm{~cm} \) in height, so that it appea...

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How much water should be filled in a container \( 21 \mathrm{~cm} \) in height, so that it appears half filled when viewed from the top of the container? (given that \( { }_{a} \mu_{w}=4 / 3 \) )
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