Assertion :The focal length of lens does not change, when red light is replaced by blue light. Reason: The focal length of lens does not depends on colour of light used.

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 D Both Assertion and Reason are incorrect
The focal length of a lens is given by the lens maker's formula
$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$
Hence the focal length depends upon the refractive index of light used which is different for all wavelengths.

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Assertion :The focal length of lens does not change, when red light is replaced by blue light. Reason: The focal length of lens does not depends on colour of light used.

The correct option is D Both Assertion and Reason are incorrectThe focal length of a lens is given by the lens maker's formula1f=(μ−1)(1R1−1R2)Hence the focal length depends upon the refractive index of light used which is different for all wavelengths.

The correct option is D Both Assertion and Reason are incorrect
The focal length of a lens is given by the lens maker's formula
$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$
Hence the focal length depends upon the refractive index of light used which is different for all wavelengths.