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Part of Geometric Optics in AP® Physics 2: Algebra-Based. Read the opening section, then create a free account for the full interactive lesson, practice, and progress tracking.
Refraction happens when light passes through one material (or medium) to another and bends. For example, think about how a straw in a glass of water seems to be bent. This happens because when light enters a denser medium, it has to slow down. This is a result of light wanting to take the shortest possible path to go from point a to point b.
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Stellar