concave diffraction grating

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concave diffraction grating

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$Diffraction grating$
In diffraction grating
…further classified as plane or concave, the latter being a spherical surface ruled with lines that are the projection of equidistant and parallel lines on an imaginary plane surface. The advantage of a concave grating over a plane grating is its ability to produce sharp spectral lines without the aid…
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Rowland

In Henry Augustus Rowland
…American physicist who invented the concave diffraction grating, which replaced prisms and plane gratings in many applications, and revolutionized spectrum analysis—the resolution of a beam of light into components that differ in wavelength.
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