Refractive index n = c/v. For glass n=1.5, light speed is:

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v = c/n = 3×10⁸/1.5 = 2×10⁸ m/s. Direct refractive index formula application. Memory tip: 'Higher n ⇒ slower light; v = c/n'. Basic optics calculation frequently tested in competitive exams to verify formula recall and unit handling.

Refractive index n = c/v. For glass n=1.5, light speed is: MCQ with Answer and Explanation

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