FIELD: physics.
SUBSTANCE: proposed device comprises at least two regions, each incorporating surface prism structure that forms the array of, in fact, flat faces. Each area form reflector due to full internal reflection for at least first angle of observation and is transparent for at least second angle of observation. Said first angle of observation of one region differs from at least one first angle of observation of the other area.
EFFECT: authentification of various substrates to due ability of complex switching of optical image.
63 cl, 40 dwg
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