FIELD: physics.
SUBSTANCE: optical device can be used for protection against falsification. The optical device includes the relief-structured layer containing the first and second areas, first layer made from the first material with an index of refraction differing from an index of refraction of the material of relief - structured layer, and coating the relief - structural layer, and the second layer made from the second material, differing from the first material, and coating the first layer.
EFFECT: improvement of precision of positioning of reflective layer at fabrication of the protective device.
15 cl, 18 dwg, 1 tbl
