$.$ Light from two sources, $1=623$ nm and $2=488$ nm$,$ is incident on a diffraction grating that has $5550$

lines$/$cm$.$ What is the angular separation,

$1$

$2,$ of the second order maxima of the two waves?

A$)11\mathrm{.}0$

B$)15\mathrm{.}0$

C$)25\mathrm{.}0$

D$)32\mathrm{.}8$

E$)43\mathrm{.}8$