posted by Cassie .
A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at an angle of θ = 30°, with your line of sight just grazing the upper left edge of the tank, and height of the tank is 50cm.
(a) What mark do you see on the meter stick if the tank is empty?
(b) What mark do you see if the tank is half full of water?
(c) What mark do you see if it is completely full of water?