|Nov7-12, 09:15 PM||#1|
Poisson/Arago's spot in water?
So Poisson's spot is a (peculiar) effect of light due to its wave nature (it's the bright point one would see in the middle of the shadow of a perfectly round coin).
So I was wondering, has Arago's spot been observed for water waves too? For example in a 2D equivalent, i.e. for surface gravity waves.
|Nov8-12, 08:42 AM||#2|
Interesting.... it seems that there could be, but water waves are slightly different than electromagnetic waves- the dispersion relation for example, and dissipation due to viscosity. Lamb only treats sound waves diffracted though a aperture that is smaller than the wavelength, and those results do not indicate any phenomenon similar to the spot of Arago.
Seems like a good undergraduate project, actually!
|Nov8-12, 08:47 AM||#3|
The 2D equivalent would be like an inverted single slit experiment - should be observable.
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