Question

Speed of light in air medium is​

Answer 1

Answer:

3×10^8

is the speed of light

Answer 2

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For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200000 km/s (124000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

• One light year: 1.0 year
• From Moon to Earth: 1.3 s
• The length of Earth's equator: 134 ms
• Parsecs per year: 0.307