can light be slowed down????
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speed of light can be slowed slightly as it travels through materials such as water or glass. However, it has generally been thought impossible for particles of light, known as photons, to be slowed as they travel through free space, unimpeded by interactions with any materials.
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speed of light depends on the refractive index of the medium .speed of light is directly proportional to refractive index of the medium. refractive index of glass is less than air so speed of light slows down in glass
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