Question

Speed of light in vaccum is​

Answer 1

Explanation:

approximately 300,000 kilometers per second

Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).

Answer 2

Answer:

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The speed of light in a vacuum is​ approximately 300,000 kilometers per second.

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Explanation:

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Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water and 200,000 kilometers per second in glass (refractive index of 1.5)

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