An educational science film that explores the historical contributions of Joseph von Fraunhofer (1787–1826) to the field of optics, particularly the phenomenon of dispersion. Directed by Alfred Leitner and produced at Rensselaer Polytechnic Institute, the film replicates Fraunhofer’s pioneering optical experiments, including his discovery of dark absorption lines (now known as Fraunhofer lines) in the solar spectrum. The film emphasizes both the scientific innovations and the technical craftsmanship involved in Fraunhofer’s work, making it valuable for historical and scientific education.