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Physics
Classical Physics
Poisson Spot Madness: Laser & Coin Lens Experiment
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[QUOTE="sophiecentaur, post: 6271798, member: 199289"] I see where you're going with this. But, unlike a spherical lens in which can be a high level of what is referred to as spherical distortion, for a solid disc or sphere there is a [I]massive[/I] range of distances where you get some form of 'focus'. Right in close there is a shadow and at a great distance there is no peak (afaik). The Fraunhoffer (distant) pattern of a round aperture is an Airey Disc and the inverse pattern for a solid disc will have a hole of the same angular size in the centre. The Fresnel pattern seems to be what you get in the near field and has the (fuzzy) Poisson spot. The diffraction pattern of a neutral density sphere (no change of refractive index) would presumably resemble the inverse of the pattern of an opaque sphere at infinity. [/QUOTE]
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Poisson Spot Madness: Laser & Coin Lens Experiment
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