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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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to the vertical. It passes into water and halves its angle to the vertical. What is the index of refraction of water?
with another medium. If the light wave is at a new angle of 
, what is the index of refraction for the second medium?