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The wavelength of the light of red and blue colours are nearly 7.8×10⁻⁷ m and 4.8×10⁻⁷ m respectively. Which colour has greater speed in vacuum?
Light travels a distance of '10x' units in time 't₁' in vacuum and it travels a distance of 'x' units in time 't₂' in a denser medium. Using this information answer the question that follows:
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