The intensity of light with wavelength traveling through a diffraction grating with N slits at an angle θ is given by I(θ) = N2sin2k/k2, where and K = (πNdsinθ)/λ and d is the distance between adjacent slits. A helium-neon laser with wavelength λ = 632.8 x 10-9 m is emitting a narrow band of light, given by -10-6

emerging from the grating.

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