Reciprocity theorem in colloid optics case of orientated particles

Abstract

The effect of orientation of the particles on the reciprocity relation as well as on the intensity and state of polarisation of the scattered light has been studied for the case of graphite sol. Magnetic fields were employed as the external orientating agency. The depolarisation factors ρ_u, ρ_v and ρ_h of the transversely scattered light have been measured with the magnetic field (1) perpendicular to the incident beam and the direction of observation, (2) parallel to the direction of observation and (3) parallel to the direction of the incident beam. The values of ρ_u, ρ_v and ρ_h are found to satisfy the reciprocity relation only when the magnetic field is perpendicular to both the incident and the scattered beams. In the other two cases the reciprocity relation is not satisfied. Marked changes are observed in the intensities of the components V_v , H_v, V_h and H_h and also in the values of ρ_u, ρ_v and ρ_h.