Assertion :The polarization is a convolution of the electric field at previous times with time-dependent susceptibility. Reason: It takes time for electrons to reach to surface.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Explanation:
The polarization is a convolution of the electric field at previous times with time-dependent susceptibility given by $χ_{e} (Δ t)$ .The upper limit of this integral can be extended to infinity. An instantaneous response corresponds to Dirac delta function susceptibility $\chi _{\text{e}}(\Delta t)=\chi _{\text{e}}\delta (\Delta t)$ .
Hence Reason is correct for Assertion, so, Option A is correct

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