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Physics for IGCSE & O level - Rays And Waves (Section 2 - No. 46)

What is the formula for the refractive index?
Speed of light in medium / Speed of light in vacuum
Speed of light in vacuum / Speed of light in medium
Wavelength / Frequency
Frequency / Wavelength

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The refractive index is speed of light in vacuum / speed of light in medium.

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