  We use micromagnetic modelling to demonstrate the operation of graded index
lenses designed to steer forward-volume magnetostatic spin waves by 90 and 180
degrees. The graded index profiles require the refractive index to diverge in
the lens center, which, for spin waves, can be achieved by modulating the
saturation magnetization or external magnetic field in a ferromagnetic film by
a small amount. We also show how the 90$^\circ$ lens may be used as a beam
divider. Finally, we analyse the robustness of the lenses to deviations from
their ideal profiles.
