Reflection by thin layers. In the figure, light is incident perpendicularly on a thin layer of material $2$ that lies between $($thicker$)$ materials $1$ and $3.($The rays are tilted only for clarity.$)$ The waves of rays $r_1$ and $r_2$ interfere, and here we consider the type of interference to be either maximum $($ max $)$ or minimum $(min).$ The table below provides the indexes of refraction $n_1,n_2,$ and $n_3,$ the type of interference, and the thinlayer thickness $L$ in nanometers. Give the wavelength that is in the visible range.

$n_1,n_2,n_3$ Type $L,$

$1\mathrm{.}59,1\mathrm{.}37,1\mathrm{.}47,$min,$419$