one-way mirror

noun
a sheet of glass that can be seen through from one side and is a mirror on the other, used especially for observation of criminal suspects by law-enforcement officials or witnesses.
Also called two-way mirror.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Through a one-way mirror, a video camera is recording the transaction.
Her new plan is to turn out the lights and put a reflective sheet against the
  window, transforming it into a one-way mirror.
Rather than watching through a one-way mirror, clients observe from their
  computer terminals.
The box is composed of a one-way mirror attached directly to the wall.
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