Micromachined wafers make featherweight x-ray lenses for space telescopes

To cut weight from x-ray space telescopes, Tokyo Metropolitan University is micro-machining x-ray lenses from silicon. The lenses exploit the nature of x-rays, which can reflect if they approach a flat surface almost parallel to it, at a slight glancing angle. The Tokyo x-ray lens is machined from a 100mm silicon wafer using reactive ion ...

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