Answer:
D) They analyze the composition of stars.
Explanation:
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Spectrographs help astronomers classify stars to measure the brightness of stars.
Spectrograph segregates incoming light according to its wavelength or frequency. After which, the resulting spectrum is recorded on a photographic plate.
The spectrum formed on the plate shows the brightness of stars on the intensity level.
Therefore, Spectrographs help astronomers classify stars to measure the brightness of stars.
Learn more about spectrograph.
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