The slower light travels in a given media, the greater the index of refraction.

Name: The slower light travels in a given media, the greater the index of refraction.
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This is a fundamental principle of optics known as Snell's law, which states that the ratio of the speed of light in a vacuum to its speed in a given media equals the index of refraction of that media. Therefore, the greater the index of refraction, the slower light travels in that media.

The Slower Light Travels in a Given Media, the Greater