Resolvance of GratingResolvance or "chromatic resolving power" for a device used to separate the wavelengths of light is defined as The limit of resolution is determined by the Rayleigh criterion as applied to the diffraction maxima, i.e., two wavelengths are just resolved when the maximum of one lies at the first minimum of the other.
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Examples of ResolvanceA standard benchmark for the resolvance of a grating or other spectroscopic instrument is the resolution of the sodium doublet. The two sodium "D-lines" are at 589.00 nm and 589.59 nm. Resolving them corresponds to resolvance Another standard example is the resolution of the hydrogen and deuterium lines, often done with a Fabry-Perot Interferometer. The red lines of hydrogen and deuterium are at 656.3 nm and 656.1 nm, respectively. This requires a resolvance of |
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Resolvance of Grating
This gives the basic ideas, but the assumptions are shaky, so you might want a real derivation. |
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Resolvance of Grating |
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