Astrophysics (Index)About

grazing incidence optics

(GIO)
(optics that avoid large changes to the angle of rays)

Grazing incidence optics (sometimes abbreviated GIO) is optics that aims to reflect EMR such as to change its angle only slightly, i.e., the angle between the incoming EMR's path and the reflecting material (grazing angle) is small, e.g., less than 2°. This is common for X-ray telescopes, because the EMR can penetrate many materials but can be reflected if the grazing angle is small, a severe restriction on such telescope design. The Wolter telescope is designed around grazing incidence optics. A consequence of this is the telescopes are relatively long: both Chandra X-ray Observatory and XMM-Newton have telescopes on the order of 10 meters in length.


(optics,telescopes)
Further reading:
https://en.wikipedia.org/wiki/Wolter_telescope#X-ray_mirror_telescope_design

Referenced by pages:
NICER
NuSTAR
Wolter telescope

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