Chapter 1: Prolegomenon
=======================

Source: Eugene Hecht, *Optics*, fifth Global Edition, Chapter 1.
Prompts are paraphrased by topic rather than reproduced.  An asterisk in
the heading preserves the book's marker for a problem omitted from its selected
solutions; the derivation below is supplied independently.

Problem inventory
-----------------

Chapter 1 is introductory and has no end-of-chapter problem set in this
edition.