Assertion (A): The optical dielectric constant (i.e., ?r at optical frequencies)

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Question
Assertion (A): The optical dielectric constant (i.e., ?_r at optical frequencies)of ionic dielectrics is less than static dielectric constant.
Reason (R): At optical frequencies, P_i = 0.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Correct Answer

Both A and R are true and R is correct explanation of A