Finding Nemo

Finding $a_{\psi\,ne}$ in light dispersion...

still looking...

where's Nemo?

My guess is,

$\lambda_{ne}=460\,nm$,  which is also the solar irradiance peak.

 $a_{\psi\,ne}=\cfrac{\lambda_{ne}}{2\pi}=\cfrac{460*10^{-9}}{2\pi}=7.321\text{e-8}\,m$

 $a_{\psi\,ne}=7.321\text{e-8}\,m$

Have a sunny day.