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55. While you are under water in a pool,..-阿摩線上測驗
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55. While you are under water in a pool, you look up and see objects above water in a circle of light
with a radius ?. The rest of your vision is the color of the sides of the pool. Assume that the index
of refraction of air is 1 and that of water is n. How deep are you in the pool?
(A) 
(B) 
(C) 
(D) Rn
(E) 