One-way glass is a glass that has reflective and transparent properties.
Glass is coated in a thin layer of metal forming what is called a half-silvered surface. This surface not only reflects light that strikes the surface but allows some light to pass through (half reflected/ half pass through).
One-way glass gains the appearance of a normal mirror when placed between a brightly lit and dark environment. Light is reflected from the bright environment creating mirror reflections however is transparent from the dark environment as a result of light passing through the half-silvered surface. This effect is ruined/less effective when both environments encapsulate bright light (When lights are switched on in dark room).
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