Why do telescopes such as TRACE and SOHO use special mirrors to reflect Extreme ultraviolet ?
Two of his sounding rocket payloads , the Stanford / MSFC Rocket Spectroheliograph Experiment and the Multi-Spectral Solar Telescope Array , recorded the first full - disk , high - resolution images of the Sun in XUV with conventional geometries of normal incidence optics ; this technology is now used in solar telescopes such as SOHO / EIT and TRACE , and in the fabrication of microchips via ultraviolet photolithography .