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Why is the ratio of the velocities of li...

Why is the ratio of the velocities of light of wavelengths 4000 Å and 8000 Å in vacuum 1 : 1?

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in vacuum the light of each wavelength travels with the same speed i.e., the speed of light of wavelength of 4000 Å is same as that of light of wavelength 8000Å.
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ICSE-QUESTION PAPER-2018 -SECTION-II
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  11. A ray of light XY passes through a right angled isosceles prism as sho...

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  12. A ray of light XY passes through a right angled isosceles prism as sho...

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