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Physics for IGCSE & O level - Rays And Waves (Section 10 - No. 3)

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

توضيح

Refractive index is calculated as the speed of light in a vacuum divided by the speed of light in a medium.

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