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/usr/share/psychtoolbox-3/PsychRadiometric/WavelengthNmToFrequencyTHz.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function [frequencyTHz] = WavelengthInNmToFrequencyInTHz(wavelengthNm)
% [frequencyTHz] = WavelengthInNmToFrequencyInTHz(wavelengthNm)
%
% How to do this conversion is available in many places, but I
% got it from Rodieck, First Steps in Seeing, p. 517.  There
% you can read that 500 nm <-> 600 THz.
% 
% 5/23/14  dhb  Wrote it.

NmPerTHz = 300000;

frequencyTHz = NmPerTHz/wavelengthNm