鏡

1. Origins, structure, and basic meaning

• Structure: 鏡 is read かがみ and means a mirror used to see a reflection.
• Basic usage: It is used for checking one's hair before going out or wiping a fogged surface.

2. Common pitfalls and similar expressions

• 見る and 映る
  • 鏡を見る describes a person looking at a mirror, while 鏡に映る describes an image being reflected in it.