grazing-incidence telescope

grazing-incidence telescope

[′grāz·iŋ ¦in·səd·əns ′tel·ə‚skōp]
(astronomy)
An instrument for forming images of celestial x-ray or gamma-ray sources in which the total external reflection of the x-rays or gamma rays from a surface at sufficiently shallow angles of incidence is used to focus them.
References in periodicals archive ?
Calibration will be tricky with the spectrophotometers, which will collect extreme-ultraviolet photons using grazing-incidence telescopes.