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6. [10 marks] Fermat's Principle Fermat's principle, net to be confused with his last theorem, is that light travels the path that takes the least

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6. [10 marks] Fermat's Principle Fermat's principle, net to be confused with his last theorem, is that light travels the path that takes the least time. We knew that the speed of light in a medium is given by u = c where a is the index of refraction. Assuming that n. = any\

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