Illustration of the spectrum of sunlight, with absorption lines (vertical), drawn by the German physicist Joseph von Fraunhofer (1787-1826). The absorption lines, known as Fraunhofer lines, indicate the presence of certain elements in the Sun's atmosphere and were discovered by Fraunhofer in 1814. From Determination of the Refractive and Dispersive Indices of Differing Types of Glass in Relation to the Perfection of Achromatic Telescopes (1817). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / ETH-Bibliotek Zurich |
Bildgröße: | 5739 px × 3050 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |