To focus X rays, such as those collected in the Chandra X–Ray Observatory, it is necessary to usea. a lens.b. a concave glass mirror, such as that used in an optical reflecting telescope.c. a metal dish, such as that used in a radio telescope.d. grazing incidence optics shaped like a converging, hollow tube.e. a mesh of conducting wires.

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Miya Swanson · Accepted Answer

Introduction:The Chandra X–Ray Observatory is a Flagship-class space telescope sensitive to X-ray sources 100 times fainter than any previous X-ray telescope, enabled by the high angular resolution of its mirrors. Since the Earth&#039;s atmosphere absorbs the vast majority of X-rays, they are not detectable from Earth-based telescopes. Thus, space-based telescopes are required to make these observations. Chandra is an Earth satellite in a 64-hour orbit, and its mission is ongoing as of 2021.Explanation:The most common methods used in X-ray optics are grazing incidence mirrors and collimated apertures. Chandra is an optical telescope that uses a large, curved-glass primary mirror to gather light, but X-rays would penetrate such a mirror’s reflective coating. X-ray photons would be absorbed by normal mirror surfaces, so mirrors with a low grazing angle are necessary to reflect them.Thus, in the Chandra X–Ray Observatory, it is necessary to use (d) grazing incidence optics shaped like a converging, hollow tube.

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