One-way-mirror meaning

A mirror that is reflective on one side and transparent on the other, often used in surveillance.
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A mirror reflecting images on one side and transparent on the other, often used by the police during an interrogation.

"The trainee interviews a client in a one-way mirror room or in front of a video camera while being observed by the supervisor, who guides the therapy by telephoning suggestions or bringing the trainee out for discussion." "” Learning and Teaching Therapy by Jay Haley.

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Origin of one-way-mirror