BOHAN PHOTONICS

Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

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https://drive.google.com/open?id=15ju2xYSsxPvxQnInJNarWXvIt8iRiSWC