Worked Exercise Solutions
=========================

This section is a growing collection of textbook-style exercises solved one
small step at a time.  The aim is not only to obtain an answer, but to make
each mathematical decision visible: what is known, which equation applies,
how it is rearranged, how units are handled, and how the result is checked.

Start with :doc:`writing_a_solution` when adding an exercise.  The thin-lens
example introduces the solution format; book-specific collections have their
own parent pages.

.. note::

   Record the book title, edition, chapter, and exercise number, but write the
   problem in your own words unless the text permits reproduction.  A short
   paraphrase is enough to understand and solve the exercise.

.. toctree::
   :maxdepth: 1

   writing_a_solution
   thin_lens_image_distance
   understanding_lasers