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Astronomy and Cosmology
Astronomy and Astrophysics
Diffraction Effects and Artifacts in Telescopes like the JWST
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[QUOTE="sophiecentaur, post: 6820260, member: 199289"] And your point is? The equipment he uses is introducing some coherence with a collimating slit which is causing the formation of diffraction effects. You don't only get diffraction effects with a high quality laser. And I think we have gone past the stage, in this discussion, where we should be quoting links showing ripples on water. To discuss the limitations imposed on the basic calculations of diffraction, you need to introduce the concept and effects of coherence. The coherence length of any source is the mean length over which all the individual bursts of light exist - very long for a good laser, short for a discharge tube and even shorter from a hot object. Interference will only occur when the path differences involved are shorter than the coherence length. That will be about boresight when you use sunlight. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Diffraction Effects and Artifacts in Telescopes like the JWST
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