Q&A: One-way or two-way mirror?

phrase meaning - One or two-way mirror? - English Language & Usage Stack Exchange

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Dark and light are the keys to one-way mirrors - Sketchplanations

This house I showed has a two-way mirror in the master closet overlooking the bathtub. : r/DiWHY

Acrylic PMMA 2-way/see-thru Mirror, 3.0mm Thickness .118, 12 Sizes Available

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6mm One Way Mirror/Two Way Mirror for Observed in The Dark - China Observation Mirror, One Way Mirror

One-way mirror - Wikipedia