Which of the following best describes how and why x-ray telescopes differ from visible light telescopes?
A) X-ray telescopes use grazing incidence mirrors because x-ray photons will penetrate a normal mirror.
B) X-ray telescopes must be much larger because of the small number of x-ray photons.
C) X-ray telescopes cannot do spectroscopy because all x-ray photons have the same wavelength.
D) X-ray telescopes have to be built with very thick mirrors because x-ray photons will penetrate a thin mirror.
E) X-ray telescopes do not use mirrors because x-ray photons cannot be focused.
A) X-ray telescopes use grazing incidence mirrors because x-ray photons will penetrate a normal mirror.
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Fill in the blank(s) with correct word
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