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(a) An engineer wants to use an optical cable out of glass material with n =...

(a) An engineer wants to use an optical cable out of glass material with n = 1.25. This cable is to be run under water (n = 1.33). Is the engineer going to be successful? Explain in one or two complete sentences why or why not. (b) If the critical angle needs to be 56.5° in order for this cable to work, what would the index of refraction of the material need to be? (c) What exactly is a critical angle, anyway? Explain in one or two complete sentences.

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