Same as Fig. 2 for media of refractive indices m = (1.30 ≤ m_r ≤ 2.70) + i (0.20 ≤ m_i ≤ 0.30) having different particle sizes x, under similar volume fractions. It can be seen from panels (a) and (b) that as the real part of the refractive index m_r increases, the negative polarization curves get deeper, with almost identical features in each of the cases. Furthermore, the minimum of polarization angle α_min, is independent of m_r. However, as m_r keeps increasing, the polarization turns out to be positive (c).