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A student studies that the speed of light in air is 300000 kms/ sec where that of speed in a glass slab is about 197000 kms/ sec. What causes the difference in
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National Schools' Observatory - We start our month of Astronomy In Numbers with a big one! The speed of light (symbol c) is 300,000 km/s...don't believe us? Have a go at measuring
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Light travels -----km per second in air or vacuum.