1.

What is the speed of light in vacuum​

Answer»

approximately 300,000 kilometers per secondExplanation: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).



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