45. The ruling separation is d= 1/(400 mm–1) = 2.5 ×10–3mm. Diffraction lines occur at angles θsuch that dsin = mλ, where λis the wavelength and mis 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 λto be the longest wavelength in the visible spectrum (700 nm) and find the greatest
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