This paper describes the design of a two-component grazing-incidence mirror system for use with a grazing-incidence spectrometer in order to record spatially resolved solar spectra in the 150–850-Å region. Photoelectric measurements are presented of the point spread function and reflectivity of the mirror system at discrete wavelengths in the extreme ultraviolet.
C. R. Negus, "Grazing-incidence Mirror System for Use with a Grating Spectrometer in the Extreme Ultraviolet," Appl. Opt. 13, 1216-1222 (1974)