(This is a writeup of Exercise 1.3 [https://tgvaughan.github.io/sicm/chapter001.html#Exe_1-3] from Sussman and Wisdom's "Structure and Interpretation of Classical Mechanics". See the solutions repository [https://github.com/sritchie/sicm] for more.) * Law of Reflection * Geometry * Calculus * Law of Refraction »