What technique is necessary to produce a telescope for focusing X-rays from astronomical sources?
A) The telescope must be placed at high-altitude mountain sites because the X-rays penetrate only this far into the atmosphere.
B) The main mirror must be cooled to prevent the highly energetic X-ray photons from heating and distorting it, thereby producing poor images.
C) The X-rays must be reflected at grazing incidence to the mirror surface; otherwise they will simply pass straight through the mirror.
D) The mirror surface has to have a thick aluminum coating in order to reflect the highly penetrating X-rays.

Question

Quizplus · Accepted Answer

X-rays have very high energy and will pass through most materials unless they are reflected at a very shallow angle, known as grazing incidence. This technique allows X-ray telescopes to focus X-rays from astronomical sources effectively.

What Technique Is Necessary to Produce a Telescope for Focusing