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Same double-slit assembly (0.7 mm between slits); in top image, one slit is closed. In the single-slit image, a diffraction pattern (the faint spots on either side of the main band) forms due to the nonzero width of the slit. This diffraction pattern is also seen in the double-slit image, but with many smaller interference fringes.
Diagram of a two slit diffraction problem, showing the angle to the first minimum, where a path length difference of a half wavelength causes destructive interference. Multiple-slit arrangements can be mathematically considered as multiple simple wave sources, if the slits are narrow enough.
In Young's experiment, the individual slits display a diffraction pattern on top of which is overlaid interference fringes from the two slits (Fig. 2). In contrast, the Lloyd's mirror experiment does not use slits and displays two-source interference without the complications of an overlaid single-slit diffraction pattern.
Thomas Young's sketch of two-slit diffraction for water waves, which he presented to the Royal Society in 1803. The effects of diffraction of light were first carefully observed and characterized by Francesco Maria Grimaldi, who also coined the term diffraction, from the Latin diffringere, 'to break into pieces', referring to light breaking up into different directions. [6]
Description: A vectorized version of a sketch made by Thomas Young to illustrate the two-slit diffraction of light. Narrow slits at A and B act as sources, and waves interfering in various phases are shown at C, D, E, and F. Young presented the results of this experiment to the Royal Society in 1803.
For example, when a slit of width 0.5 mm is illuminated by light of wavelength 0.6 μm, and viewed at a distance of 1000 mm, the width of the central band in the diffraction pattern is 2.4 mm. The fringes extend to infinity in the y direction since the slit and illumination also extend to infinity.
2.4 Diffraction and interference. 3 Astrophysics definitions. 4 See also. 5 Sources. 6 Further reading. ... N-slit diffraction (N ≥ 2) d = centre-to-centre ...
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