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Reference.org
One-way mirror
open-in-new
<p>A one-way mirror, also called two-way mirror (or one-way glass, half-silvered mirror, and semi-transparent mirror), is a <a href="/facts/Reciprocity_(electromagnetism)/ugX6mhH9">reciprocal</a> <a href="/facts/Mirror/wMu4u6BB">mirror</a> that appears reflective from one side and transparent from the other. The perception of one-way transmission is achieved when one side of the mirror is brightly lit and the other side is dark. This allows viewing from the darkened side but not vice versa. </p>