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character: Pierre de Fermat
topic: Principle of Least Time
grade: 11
subject: Physics
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character: Optics
topic: Fermat's Principle in light travel
grade: 11
subject: Physics
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character: Snell's Law
topic: Application of the Principle of Least Time
grade: 11
subject: Physics
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character: Reflection and Refraction
topic: Consequences of Fermat's Principle
grade: 11
subject: Physics
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