Two identical plates \( P \) and \( Q \), radiating as perfect black bodies, are kept in vacuum at constant absolute temperatures \( T_{P} \) and \( T_{Q} \), respectively, with \( T_{Q} < T_{P} \), as shown in Fig. 1. The radiated power transferred per unit area from \( P \) to \( Q \) is \( W_{0} \). Subsequently, two more plates, identical to \( P \) and \( Q \), are introduced between \( P \) and \( Q \), as shown in Fig. 2. Assume that heat transfer takes place only between adjacent plates. If the power transferred per unit area in the direction from \( P \) to \( Q \) (Fig. 2) in the steady state is \( W_{s} \), then the ratio \( \dfrac{W_{0}}{W_{s}} \) is ___________.
