How to find v with c and n?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
This is straightforward using the basic refractive index formula rearranged:
v = c/n
Simply divide the speed of light in vacuum (c = 3 × 10⁸ m/s) by the refractive index (n) of the material. For instance, if glass has n = 1.5, then v = 3 × 10⁸/1.5 = 2 × 10⁸ m/s.
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