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Question

Light travels at maximum speed in-

A
Air
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B
Water
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C
Vacuum
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D
None of these
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Solution

The correct option is C Vacuum
Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3) and 200,000 kilometers per second in glass (refractive index of 1.5). The interaction of the light with the particles in the medius causes the delay.

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