Spectral lines are of particular importance in astronomy because each different element has a characteristic line spectrum Option(a) is correct.
A Spectral lines are known to be as the lines which is a dark or also called as the bright line in an continuous spectrum over a period of the time in a country.
A Spectral line acts as an fingerprint which can be basically used to determine the atoms the molecule or the elements if one separate the incoming light from actually a celestial source as per using the prism it would look like a color of spectrum merely crossed with discrete lines.
Therefore Option(a) is correct.
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