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Chapter 1: Thin Lenses
1. Why This Matters
Have you ever wondered how a camera captures a moment in perfect focus? Or how a pair of glasses can turn a blurry world sharp? Or how a telescope brings distant stars close enough to see? Or how your own eye turns light into the images you are reading right now? Every one of these is a story about lenses.
A lens is a piece of transparent material — usually glass or plastic — shaped to bend light in a controlled way. Thin lenses are among the most
