At what angles with X-rays of wavelength $1.542\times 10^{-10}m$ undergo first order and second order reflections by planes separated by $3.5\times 10^{-10}m$?

Question

$\begin{array}{1 1}12.73^{\large\circ},26.14^{\large\circ}\\22.73^{\large\circ},16.14^{\large\circ}\\32.73^{\large\circ},36.14^{\large\circ}\\42.73^{\large\circ},46.14^{\large\circ}\end{array} $