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Question

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.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
1f=(μ1)(1R11R2)
Hence the focal length depends upon the refractive index of light used which is different for all wavelengths.

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