“diffraction grating”的概念、定义、习题解题方法及翻译-物理辞典

单词	diffraction grating
释义	diffraction grating A device for producing spectra by diffraction and interference. The usual grating consists of a glass or speculum-metal sheet with a very large number of equidistant parallel lines ruled on it (usually of the order of 1000 per mm). Diffracted light after transmission through the glass or reflection by the speculum produces maxima of illumination (spectral lines) according to the equation mλ = d(sini + sinθ) , where d is the distance between grating lines, λ is the wavelength of the light, i is the angle of incidence, θ the direction of the diffracted maximum, and m is the ‘order’ of the spectral line. Reflection gratings are also used to produce spectra in the ultraviolet region of the electromagnetic spectrum
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