one-way mirror

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one-way +‎ mirror


one-way mirror (plural one-way mirrors)

  1. 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