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- (9) At what angle would light leaving the straw not escape the sparkling water?
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- Light cannot escape the sparkling water if it leaves the straw at an angle greater than the critical angle. The critical angle occurs when is 90°:
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- (10) How fast does light travel in sparkling water?
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- Recall that the index of refraction is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium:
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