![]() This vacuum speed of light, c, is what the statements from relativityĭescribe. Light traveling through anything other than a perfect vacuum will scatter off off whatever particles exist, as illustrated below. So a vacuum would not containĪny dust particles (unlike a vacuum cleaner, which is generally full of " NothingĬan travel faster than the speed of light in a vacuum." " LightĪ vacuum always travels at the same speed." ThoseĪdditional three words in a vacuum are very important. Let's add a few words to them to clarify. Have you heard these statements before? They are often quoted as results " Light always travels at the same speed." ![]() " Nothing can travel faster than the speed of light." The Speed of Light and the Index of Refraction The Speed of Light and the Index of Refraction
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