17. A grating with line spacing d is used to separate light of different wavelength by the second order diffraction. θ is the diffraction angle of light with wavelength λ. The dispersion of the grating defined as dθ/dλ can be expressed as
(A)sinθ/λ
(B)2cosθ/λ
(C)sinθ/2λ
(D)tanθ/λ
(E)None of the above

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