chromatic resolving power

chromatic resolving power

[krō′mad·ik rə′zälv·iŋ ‚pau̇·ər]
(optics)
The difference between two equally strong spectral lines that can barely be separated by a spectroscopic instrument, divided into the average wavelength of these two lines; for prisms and gratings Rayleigh's criteria are used, and the term is defined as the width of the emergent beam times the angular dispersion.
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