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2015-11-10T09:06:10+05:30

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For light or any electromagnetic radiation, the velocity is always c = 299792458 meters per second, approximately 3×10⁸ meters per second in vaccuum, and it is not dependent on the wavelength or frequency of the radiation. It only depends on the medium in which the rays travel.

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He asked ratios , & wavelength got increased When it travles to denser medium
2015-11-10T09:52:46+05:30

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Since , speed of light is same in vacuum , so Ratio will be 1:1
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