A Diffraction Grating of Width W Produces a Deviation $\lambda$ In Second Order for Light of Wavelength

Multiple Choice

A diffraction grating of width W produces a deviation $\lambda$ in second order for light of wavelength $\lambda$ . The total number N of slits in the grating is given by:

A) 2W $\lambda$ /sin $\theta$
B) (W/ $\lambda$ ) sin $\theta$
C) $\lambda$ W/2sin $\theta$
D) (W/2 $\lambda$ ) sin $\theta$
E) 2 $\lambda$ /sin $\theta$