noun
image reflected in a mirror; inside of a mirror
Refers to the reflected image or the world inside a mirror. Often used in literary or poetic contexts.
鏡裏の自分を見つめる。
I gaze at my reflection in the mirror.
鏡裏の世界は左右が逆になっている。
The world inside the mirror is reversed left and right.
noun
other side of a mirror; rear of a mirror
Archaic sense referring to the physical back or reverse side of a mirror. Rarely used in modern Japanese.
古い鏡の鏡裏には装飾が施されていた。
The back of the old mirror was decorated.
鏡像 is a more common and technical term for a mirror image, while 鏡裏 is literary and emphasizes the space or world inside the mirror.
Compound of 鏡 (mirror) and 裏 (back, inside). The exact historical derivation is uncertain; the word is primarily used in literary contexts.