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Why do we stop using optics for photons above a certain energy?
I'm reading about how the soon-to-be-launched NuSTAR is on the cutting edge of focusing x-rays, which captures 5 to 80 keV radiation by focusing them with optics that have a 10.15 meter focal length ...
Jun 12 '12 at 19:01
newest x-rays telescopes questions feed
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