Liquid cartridge

A liquid cartridge comprising:

• a liquid supply port configured to provide communication between an interior and an exterior of the liquid cartridge;
• a first wall having the liquid supply port;
• a second wall spaced from the first wall;
• a third wall positioned between the first wall and the second wall;
• a first storage chamber having the first communication opening;
• a second storage chamber extending between the first communication opening of the first storage chamber and the liquid supply port and partially defined by the third wall;
• and
• a prism including first and second inclined surfaces perpendicular to each other, the first and second inclined surfaces configured to change the state of received light in response to a level of liquid contained in the second storage chamber,
• wherein:
• the first storage chamber is positioned between the first and second walls and positioned below the third wall;
• the second storage chamber is positioned between the first and second walls and partially positioned above the third wall;
• the liquid supply port is positioned below the third wall;
• and
• the prism is positioned in the second storage chamber and positioned above the third wall and positioned behind of the liquid supply port.