What is the speed of light in air if its refractive index is 1.0003
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The speed of light in air (at 1 atm and 20°C) is so close to that in vacuum, that the index of refraction of air is 1.0003. So for transitions between air and other media, unless a particular problem requires extremely high precision, you can usually take the index of refraction of air as equal to 1
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