This morning when I first pulled this reading on photochemistry and its accompanying vocabulary-building and comprehension worksheet off the shelf, I assumed it would be about developing photographs in a dark room, an arcane art that I nonetheless learned in high school in the 1970s but that is now a niche skill, I suppose.
In fact, this is a nice introduction to the actual physics of light–which is, after all, what the Greek root photo means: light.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.