Home appliances including light sensor

A refrigerator, comprising:

• a main body including a storage compartment;
• a door rotatably connected to the main body;
• a water container mounting part disposed in the door;
• a water container coupleable to and decoupleable from the water container mounting part;
• and
• an optical sensor, disposed relative to an upper side of the water container mounting part, configured to detect whether the water container is coupled to the water container mounting part or detect a water level of the water container coupled to the water container mounting part,
• wherein the water container includes:
• a water container main body having an upper side that is open;
• an inner case disposed in the water container main body,
• a water container cover to cover the upper side of the water container main body, the water container cover including a transparent panel disposed to face the optical sensor;
• and
• wherein the inner case includes a hole formed in an upper side to be positioned to face the transparent panel.

A water container coupleable to a home appliance that includes an optical sensor, the water container comprising:

• a water container main body to store water;
• an inner case, disposed in the water container main body, having a first opening on one surface of a side and a second opening adjacent to the first opening on a bottom side perpendicular to the one surface of the side;
• and
• a reflection mirror disposed to face the optical sensor and configured to guide light emitted from the optical sensor to a bottom side of the water container and guide light reflected from the bottom side and light reflected by water stored in the water container to the optical sensor,
• wherein the reflection mirror includes a reflection surface to be connected to each of the first opening and the second opening.