physics

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I beleive that it is to minimize the scattering of light rays to form a clearer image and also beause it will be easier to view the mage grom the back of the screen as well
 

PlanetMaster

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The meaning is written in b(i):
"The volume of water in the tank at the beginning of the experiment is V0."

Divide the V/cm³ written in second coloum by V0 which is 13600 (From graph at t=0).
 
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