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Visual demonstration of the performance of the diffraction grating. The zeroth order transmission refers to light that goes straight through the grating without undergoing diffraction (which should be ...

Fraunhofer lines, discovered in 1814, are dark lines in the Sun's spectrum caused by the absorption of specific wavelengths of light by elements in the solar atmosphere, marking the birth of ...

II. I HAVE already referred to the importance of applying in astronomical research the methods of the physicist. During the last quarter of a century the study of spectro-scopic phenomena in the ...