[单选题]
Monochromatic light o e3m:l q,533yfjjsa3a/jlmjis incident on a grating that is 75 mm wide and ruled wa6ql m3ru gi43ith 50,000 lines. The second-ordam qr36gl3 iu4er 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. $806 \; nm$
