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s0 = ComputeDiffLimit(pupil,nm)

Compute the diffraction limit for coherent light.
(For incoherent light the answer is 2*s0.)
See page 120 in Goodman.

"pupil" diameter in mm  
"nm" is wavelength in nm  
"s0" is highest spatial frequency passed by the pupil in cycles/deg  

Goodman, J. W. (1968) Introduction to Fourier Optics.
San Francisco: McGraw-Hill. Page 120.

Goodman’s formula involves di, which I think is the distance to the
image. Goodman’s formula gives the limit in
cycles/unit length. The formula below gives
the answer in cycles/degree.