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Mathematics 9 Online
OpenStudy (anonymous):

What best describes why the critical angle of an air-glass boundary is 39.3? A. It is the angle of refraction in glass for which the angle of incidence B. It is the angle incidence in air for which the angle of refraction in glass 90? C. It is the angle of refraction in air for which the angle of incidence in glass 90 D. It is the angle of incidence in glass for which the angle of refraction in air Is 90

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