Non parallel sides extending between the reflective surfaces are used to provide total internal reflection and concentrate {HEAD ~ all} of {TAIL ~ the incoherent light beams} into a smaller area, Alignment of the incoherent light beam according to a predetermined angle causes the escaping light beams to be adjacent to each other and produce a uniform and continuous line of light free from destructive interference areas 
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Non parallel sides extending between the reflective surfaces are used to provide total internal reflection and concentrate { HEAD ~ all } of { TAIL ~ the incoherent light beams } into a smaller area , Alignment of the incoherent light beam according to a predetermined angle causes the escaping light beams to be adjacent to each other and produce a uniform and continuous line of light free from destructive interference areas
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