1.

Speed of light in vacuum is _______​

Answer»

Answer:

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).

Explanation:

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