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The drawing shows a ray of light traveling from point A to point B, a distance of 6.40 m in a material than has an index of refraction n1. At point B, the light encounters a different substance whose index of refraction is n 1.63. The light strikes the interface at the critical angle of c-40.9°. How much time does it take for the light to travel from A to B? 21.63 Number Units

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