9. A laser beam of wavelength \(\lambda\) shined on a spectrometer with the grating spacing a is split into two beams of wavelengthsλ₁ and λ₂ due to the 2nd order diffraction. If λ₂ is slightly longer than λ₁ and θ  is the diffraction angle for \(\lambda_1\), what is the difference in diffraction angles of the two beams?
(A)
(B)
(C)
(D)

(E)None of the above

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