In the last decades spectroscopy began to play an essential role in physics education research with the recognition that atomic spectra constitute a good occasion to study the concepts of quantum mechanics. Moreover, activities in which atomic spectra are studied in order to understand star structure and evolution have proved particularly engaging for students. In this sense, the hydrogen atom spectrum is especially important in astronomy. Other researchers showed how interdisciplinary experimental activities involving interferometry and applied optics offer a good occasion to teach fundamental concepts of radiation-matter interaction.