FIELD: physics; optics.
SUBSTANCE: invention relates to the optics. The optic film comprises the cell array in which every element is designed as focusing concentrator consisting of two planar surfaces where the area of the first element surface is less than the second surface and ratio of the element height to outer diameter of the second surface is in the range from 2 to 8. The third cambered lateral face connects the contours of first and second surfaces and has the form providing the total internal reflection of the light impinging from the first surface.
EFFECT: increasing of light transmission efficiency.
14 cl, 8 dwg
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