An optical element with two refractive surfaces, at least one of which is convex or concave. In LED lamps, the task of the lens is to focus or disperse the light, thus determining the angle of illumination.
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An optical element with two refractive surfaces, at least one of which is convex or concave. In LED lamps, the task of the lens is to focus or disperse the light, thus determining the angle of illumination.