Joseph von Fraunhofer
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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 gratings and also inve
Joseph v Fraunhofer
Fraunhofer demonstrating the spectroscope
The 9"-aperture refractor telescope with which Neptune was discovered
Opere, 1888
Fraunhofer lines
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The Fraunhofer lines are a set of spectral absorption lines. They are dark absorption lines, seen in the optical spectrum of the Sun, and are formed when atoms in the solar atmosphere absorb light bei
Joseph von Fraunhofer
…gratings and also invented the spectroscope. In 1814, he discovered and studied the dark absorption lines in the spectrum of the sun now known as Fraunhofer lines. The German research organization Fraunhofer Society, which is Europe's biggest Society for the advancement of applied research, is named after him…
A demonstration of the 589 nm D2 (left) and 590 nm D1 (right) emission sodium D lines using a wick with salt water in a flame