A Single Slit That Is 2100 Nm Wide Forms a Diffraction

A single slit that is 2100 nm wide forms a diffraction pattern when illuminated by monochromatic light of 680-nm wavelength. At an angle of 10° from the central maximum, what is the ratio of the intensity to the intensity of the central maximum?

A) I/I₀ = 0.35
B) I/I₀ = 0.39
C) I/I₀ = 0.43
D) I/I₀ = 0.47
E) I/I₀ = 0.51