A Diffraction Grating That Has 4500 Lines/cm Is Illuminated by Light

Multiple Choice

A diffraction grating that has 4500 lines/cm is illuminated by light that has a single wavelength. If a second order maximum is observed at an angle of 42° with respect to the central maximum, what is the wavelength of this light?

A) 1500 nm
B) 370 nm
C) 930 nm
D) 1100 nm
E) 740 nm