First observed by William Wollaston in 1802, they are assigned letters such as A which is made by terrestrial oxygen and extremely red in color.
First observed by William Wollaston in 1802, they are assigned letters such as A which is made by terrestrial oxygen and extremely red in color. They are made by the absorption of selected wavelenghts of light by atoms of gas in the atmosphere of the sun and earth. FTP, identify these dark lines named after a German optician.
First observed by William Wollaston in 1802, they are assigned letters such as A which is made by terrestrial oxygen and extremely red in color.
Fraunhofer lines