Joseph von Fraunhofer, German physicist and astronomer (died 1826)

Joseph von Fraunhofer

German physicist (1787–1826)

Joseph Ritter von Fraunhofer was a German physicist and optical lens manufacturer. He made optical glass, an achromatic telescope, and objective lenses. He developed diffraction grating and also invented the spectroscope. In 1814, he discovered and studied the dark absorption…