Joseph Ritter von Fraunhofer (6 March 1787--7 June 1826) was a German physicist, known for discovering the dark absorption lines known as Fraunhofer lines in the Sun's spectrum, and for making excellent optical glass and achromatic telescope objectives.
Joseph Ritter von Fraunhofer (6 March 1787--7 June 1826) was a German physicist. A German physicist was known for discovering the dark absorption lines, and for making excellent optical glass and achromatic telescope objectives. These dark absorption lines were known as Fraunhofer lines in the Sun's spectrum.