Assertion :Different colours travel with different speeds in vacuum. Reason: Wavelength of light depends on the refractive index of medium.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
We have $c = ν λ$
$⟹ c \propto λ$
i.e., the velocity of light of different colors is same in vacuum irrespective of the wavelengths. On entering any medium , the frequency does not change, but the wavelength and the speed of light changes. Thus wavelength does depend upon the refractive index of the medium.

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