Question

Describe the doublet structure in sodium spectra. Why s-level is not double

Answer 1

Explanation:

The spectrum of a sodium lamp is often called "the sodium doublet" because in a spectrometer capable of resolving these nearby wavelengths, you see two bright yellow lines next to each other, a doublet. The Michelson interferometer sees the doublet rather indirectly, by the overlapping of the two fringe patterns