Describe the minimum$-$energy direct and indirect optical absorption energies for a degenerate semiconductor with direct bandgap $=2\mathrm{.}0eV$ at $k=0,m_e^{**}=0\mathrm{.}2m,m_h^{**}=0\mathrm{.}5m,$ and $n=3{10}^{19}c{m}^{-3}.$