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grazing-incidence telescope
A telescope used in extreme ultraviolet, X-rays, and gamma-ray astronomy, which utilizes the fact that electromagnetic radiation at these very short wavelengths behaves like ordinary light rays if it strikes surfaces at a shallow enough angle. Instead of the bowl of a paraboloid, the mirror of a grazing-incidence telescope consists of a ring higher up on the wall of the paraboloid so that the incoming rays meet it at acute angles and are deflected, rather than reflected, onto the detector.
Related category
• TELESCOPE EQUIPMENT AND TECHNIQUES
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