What is the speed of light in air and in the vacuum?

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Solution

The refractive index of air is about 1.0003, and from this equation we can find that the speed of visible light in air is about 90 km/s slower than c.

c ( $3 \times 10^{8} m / s$ ) is speed of light in vacuum. The speed of light is slightly slower in the air than in vacuum.

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