How to Build a Laser Death RayGrazing Incidence Mirrors | 
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Soft x-rays are absorbed very easly by matter.  They can't go through metal, and mirrors can't reflect them.  Except - mirrors can reflect soft x-rays if the soft rays are incident on the surface at very shallow angles.  This is called grazing incidence reflection.  Using grazing incidence reflection, it is possible to make a series of slight curved concentric tubes that guide the x-rays toward a focal point.
 
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