ch36-p045 - 45. The ruling separation is d = 1/(400 mm1) =...

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45. The ruling separation is d = 1/(400 mm –1 ) = 2.5 × 10 –3 mm. Diffraction lines occur at angles θ such that d sin = m λ , where λ is the wavelength and m is an integer. Notice that for a given order, the line associated with a long wavelength is produced at a greater angle than the line associated with a shorter wavelength. We take λ to be the longest wavelength in the visible spectrum (700 nm) and find the greatest
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