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Keywords: Grating condition.svg en Deriving the grating condition; at perpendicular incidence α+φ 90° inside the right-angled triangle the other angle is equal to 90°-α φ constructive interference occurs when sin φ is equal to the wavelength divided by the distance between the rulings or more generally when <math>\sin \varphi \dfrac n\lambda d n \in \Z </math> File Beugungsgitter sl svg File Beugungsgitter svg Pieter Kuiper Biezl 2012-03-22 Transmission gratings |