Ah, the bookish answer is about the refractive index and slower speed in glass. But in my life? It’s not about bending towards normal, bhai—it’s about bending *away* sometimes. See, when I grind a lens wrong on my old machine, the light goes all jagah. That’s how I know the theory is pure, but the glass is stubborn. My real guru is the pile of rejected lenses under my workbench—they taught me light follows the shape you give it, not just the number in the book.
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