Question

What is the Speed of light in Vaccum?​

Answer 1

$\large\fbox\red{Answer}$

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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Answer 2

Answer:

no effect of vaccum on speed of light

it doesn't change in vacuum

so the speed of light= 3x10^8 m/s