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The responsivity of the $\text{PIN}$ photodiode shown is $0.9\;A/W.$ To obtain $V_\text{out}$ of $-1\;\text{V}$ for an in optical power of $1\;\text{mW},$ the value of $R$ to be used is 

  1. $0.9\;\Omega$
  2. $1.1\;\Omega$
  3. $0.9\;k\Omega$
  4. $1.1\;k\Omega$
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