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The quantum efficiency $(\eta)$ and responsivity $(R)$ at wavelength $\lambda \:(\text{in}\: \mu m)$ in a p-i-n photodetector are related by

1. $R= \frac{\eta \times \lambda}{1.24}$
2. $R= \frac{\lambda}{\eta \times 1.24}$
3. $R= \frac{1.24 \times\lambda}{\eta}$
4. $R= \frac{1.24}{\eta \times \lambda}$