how speed of light change in different medium
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when light passes through a medium, like water or glass, the speed of light changes because that medium has electric and magnetic properties and light "interacts" with the medium and that's reflected in a different constant value than vacuum or other medium.
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When light enters a denser medium (like from air to glass) the speed and wavelength of the light wave decrease while the frequency stays the same. How much light slows down depends on the new medium'sindex of refraction, n. ... Light moves slower through denser media because more particles get in its way.
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