Missing lines in a continuous spectrum reveal

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(D) When a continuous spectrum is passed through a material,some wavelengths are absorbed,resulting in the formation of dark lines,which is known as a

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Presence of cool vapours of some elements around the light source

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(D) When a continuous spectrum is passed through a material,some wavelengths are absorbed,resulting in the formation of dark lines,which is known as an absorption line spectrum.This absorption occurs because cool vapors of specific elements present in the path of the light absorb the energy corresponding to their characteristic wavelengths.Therefore,the missing lines in a continuous spectrum indicate the presence of cool vapors of some elements around the light source.

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