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A one-way mirror, also called two-way mirror,〔(【引用サイトリンク】url=http://www.professionalplastics.com/2Way-SurveillanceMirror )〕 is a mirror that is partially reflective and partially transparent. When one side of the mirror is brightly lit and the other is dark, it allows viewing from the darkened side but not vice versa. == History == The first US patent for a one-way mirror appeared in 1903, then named a "transparent mirror".〔(【引用サイトリンク】title=The History of Mirrors )〕 == Design == The glass is coated with, or has encased within, a thin and almost-transparent layer of metal (usually aluminium). The result is a mirrored surface that reflects some light and is penetrated by the rest. A true one-way mirror does not, and cannot, exist.〔 Light always passes exactly equally in both directions. However, when one side is brightly lit and the other kept dark, the darker side becomes difficult to see from the brightly lit side because it is masked by the much brighter reflection of the lit side. It may be possible to achieve something similar by combining an optical isolator layer with a traditional one-way mirror, which would prevent light coming from one direction. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「One-way mirror」の詳細全文を読む スポンサード リンク
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