Brainly100
For visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200,000 km/s (124,000 mi/s); the refractive index ofair for visible light is about 1.0003, so the speed of light in air is about 299,700 km/s (186,220 mi/s) (about 90 km/s (56 mi/s)
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