Fraunhofer lines

Spectrum of blue sky. Dips are present at the Fraunhofer line wavelengths.

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

In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826). The lines were originally observed as dark features (absorption lines) in the optical spectrum of the Sun.

单词	Fraunhofer spectrum
释义	Fraunhofer spectrum 英语百科 Fraunhofer lines In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826). The lines were originally observed as dark features (absorption lines) in the optical spectrum of the Sun.
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Fraunhofer spectrum

Fraunhofer lines