Calculate the angle at which second-order reflection will occur in an X-ray spectrometer when X-rays of 0.154nm are diffracted by the atoms of a crystal having distance b/w two planes at 404 pm

Question

$\begin{array}{1 1}22.41^{\large\circ}\\32.41^{\large\circ}\\42.41^{\large\circ}\\12.41^{\large\circ}\end{array}$