Question: Which of the following expression is correct for radiation efficiency?
Options
A : \eta_r = \frac{P_r}{P_l}
B : \eta_r = \frac{P_r}{P_r-P_l}
C : \eta_r = \frac{P_r}{P_r+P_l}
D : \eta_r = \frac{P_l}{P_r+P_l}
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