![Fig. 5.3 — Spherical Bessel functions](https://i0.wp.com/opticaltweezers.org/wp-content/uploads/2015/11/Fig5_3.png?fit=660%2C331)
The first few (a) spherical Bessel functions jl(z) [Eq. (5.50)] and (b) spherical Neumann functions yl(z) [Eq. (5.51)]. When z is real, jl(z) and yl(z) are respectively equal to the real and imaginary part of the Hankel function hl(z) [Eq. (5.52)].
Fig. 5.3 — Spherical Bessel functions