When I walked into my Optics class for the first day of class this morning, I found that the publisher had put out a new edition of the textbook (which I've been using for years) without telling me!(adsbygoogle = window.adsbygoogle || []).push({});

Fortunately the old chapter 3 (where I always started) seems to be the same as the new chapter 2, so at least the first couple of weeks will require minimal adjustment.

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# An Instructor's Nightmare

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