# Diffraction-limited spot screening
# Scope: Circular-aperture first-zero angular radius, scalar far-field diffraction.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

wavelength = 550 nm
diameter = 10 mm
distance = 1 m

angle := 1.22*wavelength/diameter [rad]
spotRadius := distance*angle [um]

check spot radius budget: spotRadius <= 100 um

scenario alternative: wavelength = 440 nm