[单选题]
Monochromatic light a;q-*2 ga ebklis +sf 7;ql+eiwd2dk fs42,egq vincident on a grating that is 75 mm wide and ruled with 50,000 linef k24v+ds2,lg eiwq7qsdf; e+ s. The second-order maximum is seen at $32.5^{\circ}$. What is the wavelength of the incident light?
A. $202 \; nm$
B. $403 \; nm$
C. $605 \; nm$
D. $806 \; nm$
