Spectrum

Ever heard about spectrum, they're nothing but beam of colourfull light which was separated from single composite light.

Spectrum can be divided into two,➡️ continuous spectrum and ➡️ line spectrum other wise called as discontinuous spectrum.

This line spectrum is further divided into absorption spectrum and emission spectrum

Absorption spectrum: when you pass light towards an object(atom).it absorbs specific photons with specific wave length and get into excited state (higher energy level). When this already absorbed light rays falls some object like prism, you will receive only the unabsorbed light from the from the prism.

Absorption spectrum

On the hand after sometime the electron which absorbed photons and  reached higher level will release the photons back to the surrounding and the emitted light waves with different wavelength is called as emission spectrum.

Emission spectrum