Assertion :Critical angle of light passing from glass to air is minimum for violet colour. Reason: The wavelength of violet light is greater than the light of other colours.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The critical angle for a monochromatic ray of light is given as
$θ_{c} = t a n^{- 1} (\frac{1}{μ})$
Since $μ$ is maximum for violet light, the critical angle is minimum for the same.
Hence assertion is correct.
Also, the wavelength of violet is lesser than the light of other colors.
Hence reason is incorrect.

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