Total internal reflection | Geometric optics | Physics | Khan Academy

Critical incident angle and total internal reflection. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/dispersion?utm_source=YTutm_medium=Descutm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/geometric-optics/reflection-refraction/v/snell-s-law-example-2?utm_source=YTutm_medium=Descutm_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that go

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