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Diffraction Grating wavelength
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[QUOTE="orsanyuksek, post: 4951105, member: 37051"] 1. The diffraction formula for a maximum order is m . λ = d . (sin α + sin β) where m : Diffraction order λ: Wavelength α: Angle of incidence β: Exit angle d: The grating constant i) The grating constant, the angle of incidence and the exit angle for both wavelengths are the same. That means the right side of the equation is the same. m_short . λ_short = m_longer . λ_longer To justify the equation the third order must belong to the shorter wavelength. 3 . 424 nm = 2 . λ_longer λ_longer = 636 nm ii) mλ = d (sin α + sin β) 3 . 424 nm = d (sin 0° + sin 21,1°) d = 283 lines / mm iii.) If m = 1 (m=2) is given, the exit angle for the first (second) order is calculated etc. ----------------------- Örsan Yüksek [/QUOTE]
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Diffraction Grating wavelength
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