The meter stick lies on the bottom of a 100-cm-long tank withits zero mark against the left edge. You look into the tank at a30∘ angle, with your line of sight just grazing the upper left edgeof the tank. (Figure 1)

a) What mark do you see on the meter stick if the tank isempty?
b) What mark do you see on the meter stick if the tank is halffull of water?
c) What mark do you see on the meter stick if the tank iscompletely full of water?
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