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2. One-way mirror - Wikipedia

   en.wikipedia.org/wiki/One-way_mirror

   One-way mirrors for upper-level observation deck viewing down into a classroom (University of Wisconsin-Eau Claire) A one-way mirror, also called two-way mirror [1] (or one-way glass, half-silvered mirror, and semi-transparent mirror), is a reciprocal mirror that appears reflective from one side and transparent from the other. The perception of ...

3. Pellicle mirror - Wikipedia

   en.wikipedia.org/wiki/Pellicle_mirror

   The pellicle mirror of the Canon EOS RT. A pellicle mirror is an ultra-thin, ultra-lightweight semi-transparent mirror employed in the light path of an optical instrument, splitting the light beam into two separate beams, both of reduced light intensity. Splitting the beam allows its use for multiple purposes simultaneously.

4. Mirror - Wikipedia

   en.wikipedia.org/wiki/Mirror

   Alternatively, a flexible transparent plastic film may be bonded to the front and/or back surface of the mirror, to prevent injuries in case the mirror is broken. Lettering or decorative designs may be printed on the front face of the glass, or formed on the reflective layer.

5. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens. A related invention for enlarging transparent images is the solar camera.

6. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   Other TCOs (Transparent Conductive Oxides) include AZO (Aluminium doped Zinc Oxide), which offers much better UV transmission than ITO. A special class of transparent conductive coatings applies to infrared films for theater-air military optics where IR transparent windows need to have stealth (Stealth technology) properties.

7. Lippmann plate - Wikipedia

   en.wikipedia.org/wiki/Lippmann_plate

   The back of the film is then brought into optical contact with a reflective surface. This originally was done by mounting the plate in a specialized holder with pure mercury behind the film. When it is exposed in the camera through the glass side of the plate, the light rays which strike the transparent light-sensitive film are reflected back ...