A Diffraction Grating with 396 Lines/mm Is Illuminated with Light $343 \mathrm {~nm}$

Multiple Choice

A diffraction grating with 396 lines/mm is illuminated with light of wavelength $343 \mathrm {~nm}$ . What is the angular separation between the two second-order bright fringes?

A) $32.9 ^ { \circ }$
B) $31.5 ^ { \circ }$
C) $15.8 ^ { \circ }$