Figure 5.6 — Mie coefficients and Mie scattering Figure 5.6 — Mie coefficients and Mie scattering. (a–c) Imaginary (solid lines) and real (dashed lines) parts of the Mie coefficients al and bl [Eq. (5.100)] as a function of l for dielectric (np = 1.50) particles in water (nm = 1.33). The values of al and bl drop almost to zero above a certain threshold LMie [Eq. (5.101)] or LW [Eq. (5.102)], depending on the particle size parameter kma. (d) Scattering amplitudes from spheres with various size parameters kma illuminated by a plane wave propagating along the z-axis and polarised along the x-axis. For small particles, the scattering is symmetric around the particle, whereas as the size parameter increases, the scattering becomes more directed towards the direction of propagation. All the scattering amplitudes are normalised to the forward scattering amplitude.