The quantum efficiency η for the photo-detector is:(a) \(\frac{{{I_{ph}}}}{{{P_o}}}\)(b) \(\frac{{{I_{ph}}/e}}{{{P_o}/\left( {hv/\lambda \;} \right)\;}}\)(c) \(\frac{{{P_0}}}{{{I_{ph}}}}\)(d) \(\frac{{{P_o}/\left( {hv/\lambda \;} \right)}}{{{I_{ph}}/e}}\)where: Iph = Average photocurrentPo = Average incident optical powerhc/λ = incident photon energy

• A. a
• B. b
• C. c
• D. d