# Field singularity exponent at corners

When materials meet at a locally linear interface (a bunch of material wedges), fields can be singular in the radial direction. This computes the leading exponent of the singularity for 90 degree corners.

+i | +i
+i | +i

Field diverges as r0. S4 pretty much won't work if there is a 1/r divergence. The closer to that, the slower the convergence.

# Optics and solid-state conversions

lambda nu = c

h nu = E

Quantity | Units | Value
--- | --- | ---
Energy | eV |
Energy | J |
Wavelength | microns |
Wavelength | nm |
Wavelength | m |
Frequency | Hz |
Frequency | THz |

Visible spectral color