Half-silvered mirror is a glass sheet evenly coated with a substance which transmits part of the light incident on it and reflects the remainder. Used for beam splitting devices in holography, and for front projection.
These cameras have "pellicle" mirrors which are essentially fixed half-silvered mirrors which send some light up to the viewfinder while passing the rest through to the shutter.
In the simplest form of camera lucida, the artist looks down at the drawing surface through a half-silvered mirror tilted at 45 degrees.
 See also: Image, Exposure, Lens, Negative, Lenses
  
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