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

Multiple Choice

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

A) "2W $\lambda$ 0/sin $\theta$ "
B) "(W/ $\lambda$ 0) sin $\theta$ "
C) " $\lambda$ W/2sin $\theta$ "
D) "(W/2 $\lambda$ ) sin $\theta$ "
E) "2 $\lambda$ /sin $\theta$ "