A 400-Cm Wide Diffraction Grating with 250 Grooves Per Cm Is

A 4.00-cm wide diffraction grating with 250 grooves per cm is used to resolve two closely spaced lines (a doublet) in a spectrum.The doublet consists of two wavelengths, $\lambda$ _a = 629.8 nm and $\lambda$ _b = 630.2 nm.The light illuminates the entire grating at normal incidence.What order of diffraction is required to resolve these two lines using this grating?

A) 1
B) 1.5
C) 2
D) 2.5
E) 3

Correct Answer:

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