The ratio of velocities of light rays of wavelength \( \mathrm{P} \...

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The ratio of velocities of light rays of wavelength
\( \mathrm{P} \)
\( 4000 \AA \) and \( 8000 \AA \) in vacuum is:
W
(1) \( 1: 1 \)
(2) \( 1: 2 \)
(3) \( 2: 1 \)
(4) \( 1: 3 \)
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