ハーフミラー

noun

half mirror; one-way mirror; 50% beam splitter

A mirror that reflects about half the light and transmits the rest. In everyday contexts, it often refers to a one-way mirror used for observation or privacy. In optics, it can specifically mean a 50% beam splitter.

• 取とり調しらべ室しつにはハーフミラーが設せっ置ちされている。

  A one-way mirror is installed in the interrogation room.

• 光こう学がく実じっ験けんでハーフミラーを使つかって光ひかりを分わけた。

  In the optics experiment, we split the light using a half mirror.