Light Slows Down When Traveling Through Water or Glass

Light travels fastest in a vacuum (about 299,792 kilometers per second). When it passes through denser mediums like water or glass, it interacts with the atoms, causing it to slow down temporarily.

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https://en.wikipedia.org/wiki/Speed_of_light

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Published: March 29, 2026
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Scientific Physics Light Speed Of Light Refraction Vacuum Optics

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