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Physics
Classical Physics
Optics
Understanding Fraunhoffer Diffraction: The Role of Lenses Explained
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[QUOTE="BvU, post: 5485733, member: 499340"] The lens before the slit (or whatever) helps to get a more plane wavefront, but you can also get a clear diffraction pattern from a small laser beam. A lens after the slit then gives a sharper pattern, but a long distance to the screen achieves about the same. Google fraunhofer diffraction images and check a few pictures. The wiki [URL='https://en.wikipedia.org/wiki/Fraunhofer_diffraction_(mathematics)']lemma[/URL]: [INDENT] In [URL='https://en.wikipedia.org/wiki/Optics'][U]optics[/U][/URL], the [B]Fraunho[COLOR=#ff0000]f[/COLOR]er diffraction[/B] equation is used to model the [URL='https://en.wikipedia.org/wiki/Diffraction'][U]diffraction[/U][/URL] of waves when the diffraction pattern is viewed at a long distance from the diffracting object, and also when it is viewed at the [URL='https://en.wikipedia.org/wiki/Focal_plane'][U]focal plane[/U][/URL] of an imaging [URL='https://en.wikipedia.org/wiki/Lens_(optics)'][U]lens[/U][/URL].[URL='https://en.wikipedia.org/wiki/Fraunhofer_diffraction_(mathematics)#cite_note-1'][U][1][/U][/URL][URL='https://en.wikipedia.org/wiki/Fraunhofer_diffraction_(mathematics)#cite_note-2'][U][2][/U][/URL][/INDENT] [/QUOTE]
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Forums
Physics
Classical Physics
Optics
Understanding Fraunhoffer Diffraction: The Role of Lenses Explained
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