Type 2 nomogram code for Pynomo software. Index of refraction formula

This is a python-based code to be run under Pynomo software to construct a type 2 nomogram (N or Z nomogram) for the index of refraction expression:

\(I_{R}={{\sin I}\over{\sin R}}\)

which represents a mathematical function of the form:

\(f_{2}(u_{2})={{f_{1}(u_{1})}\over{f_{3}(u_{3})}}\)