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A 4-step lesson. Step 1: 'Total Internal Reflection (TIR) occurs when: (1) Light travels from a DENSER to a LESS DENSE medium, AND (2) The angle of incidence exceeds the CRITICAL ANGLE.' Step 2: 'Critical angle: The angle of incidence that produces a refracted angle of exactly 90°. sin(c) = n₂/n₁. F

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