A beam of red light and a beam of blue light pass from air into water. Which statement is true? a. The red-light beam travels faster than the blue light in both media. b. The blue light beam travels faster than the red light in both media. c. Both beams travel at the same speed as each other, and at the same speed in water and air. d. Both beams travel at the same speed as each other, and faster in water than in air. e. Both beams travel at the same speed as each other, and slower in water than in air.

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.