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

Refractive index n = c/v. For glass n=1.5, light speed is:
A. 4.5×10⁸ m/s
B. 1.5×10⁸ m/s
C. 2×10⁸ m/s
D. 3×10⁸ m/s
Answer: Option C
Solution (By JKSSB Mock Tests)
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.

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