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to the IRF, in which case the system is instrument limited.
# In the case where the spread of the PSF and IRF are similar, in which case both impact the available resolution of the system.

The spread of the diffraction-limited PSF is approximated by the diameter of the first null of the Airy disk,

:

where is the wavelength of the light and is the f-number of the imaging optics, i.e., in the Abbe diffraction limit formula. For instance, for an

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