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3 July, 02:15

The critical angle for total internal reflection at the boundary between an unknown substance and air is 24.4°. what is the angle of refraction in the air if light is incident on the boundary at an angle of 20.0°?

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  1. 3 July, 03:11
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    If the object, ends up with a positive charge, then it is missing electrons. if it is missing electrons, then it must have been removed form the object during the rubbing process.
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