alleryRefractive index of medium where speed of light is v is:
An = v/c
Bn = c × v
Cn = c/v
Dn = v²/c
Answer & Solution
Correct answer: C. n = c/v
n = c/v.
Higher n means slower light propagation.
**Vacuum:** n = 1. Water: n ≈ 1.33, so v_water ≈ 2.26 × 10⁸ m/s.
**Glass:** n ≈ 1.5, v ≈ 2 × 10⁸ m/s.
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