Critical angle is when light tries to go from a denser medium to a rarer one and just grazes the surface—sin C equals one over refractive index. Diamond’s is 24.4 because its refractive index is so high, around 2.42, which means total internal reflection happens easily, making it sparkle. But honestly, the only angle I care about is the one in my textbook propped against the water jug at 2 AM, trying to remember this while the fan makes my notes flutter. My tutor keeps saying "remember 24.4 for diamond," but the only thing that’s critical is my chances of passing if I don’t finish this chapter before the cha stall downstairs opens.
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