Translations:Adventist Youth Honors Answer Book/Health and Science/Optics/55/en

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One-way glass, also called a two-way mirror, or a one-way mirror, is a pane of glass with a partially reflective, partially transparent layer, used with a darkened room on one side and a well-lit room on the other, allowing those in the darkened room to see into the lighted room but not vice versa.