For the noninverting op-amp circuit in Figure P12.18, the parameters are: (A=10^{5}, A_{v f}=20, R_{i}=100 mathrm{k} Omega),

Question:

For the noninverting op-amp circuit in Figure P12.18, the parameters are: $A=10^{5}, A_{v f}=20, R_{i}=100 \mathrm{k} \Omega$, and $R_{o}=100 \Omega$. Determine the ideal closed-loop input and output resistances, $R_{i f}$ and $R_{o f}$, respectively.

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