Total Internal Reflection Basics Steps: - Recall that total internal reflection (TIR) happens when light travels from a denser medium (higher refractive index) to a rarer one (lower refractive index) at an angle greater than the critical angle. - The critical angle $c$ is given by $\sin c = \frac{1}{n}$, where $n$ is the refractive index of the denser medium. - In TIR, all light reflects back into the denser medium, following the law of reflection where angle of incidence equals angle of reflection. - Evaluate each option against these principles to identify the correct statement. Why C is correct: - TIR acts as complete reflection at the boundary, so the law of reflection applies: angle of incidence equals angle of reflection. Why the others are wrong: - A: TIR requires light to travel from denser to rarer medium (e.g., glass to air), not air to glass. - B: Larger refractive index $n$ makes critical angle $c$ smaller via $\sin c = \frac{1}{n}$. - D: TIR occurs only …