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Because diffraction is the result of addition of all waves (of given wavelength) along all unobstructed paths, the usual procedure is to consider the contribution of an infinitesimally small neighborhood around a certain path (this contribution is usually called a wavelet) and then integrate over all paths (= add all wavelets) from the source to the detector (or given point on a screen).
Graph and image of single-slit diffraction. A long slit of infinitesimal width which is illuminated by light diffracts the light into a series of circular waves and the wavefront which emerges from the slit is a cylindrical wave of uniform intensity, in accordance with the Huygens–Fresnel principle.
Schematics and diffraction pattern for Single slit experiment. 00:29, 16 March 2012: 700 × 600 (61 KB) 老陳: Schematics and diffraction pattern for the single slit experiment. 00:12, 16 March 2012: 700 × 600 (60 KB) 老陳: Diffraction schematics and pattern for single slit experiment. 04:23, 15 March 2012: 690 × 560 (56 KB) 老陳
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Graph and image of single-slit diffraction. The width of the slit is W. The Fraunhofer diffraction pattern is shown in the image together with a plot of the intensity vs. angle θ. [10] The pattern has maximum intensity at θ = 0, and a series of peaks of decreasing intensity. Most of the diffracted light falls between the first minima.
Feynman's approach was extended to N-slit interferometers for either single-photon illumination, or narrow-linewidth laser illumination, that is, illumination by indistinguishable photons, by Frank Duarte. [3] [4] The N-slit interferometer was first applied in the generation and measurement of complex interference patterns. [3] [4]
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The wavelength of light is then selected by the slit on the upper right corner. An optical spectrometer ( spectrophotometer , spectrograph or spectroscope ) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum , typically used in spectroscopic analysis to identify materials. [ 1 ]