[ATM] Difraction Spikes
Nils Olof Carlin
nilsolof.carlin at telia.com
Sat Oct 31 19:54:00 JST 2009
> Does the spider "throw energy into the spikes", or does it remove energy?
> This orthodox misdirsction is starting to annoy.
both, the authorities claim. They (the spiders in this case) will remove (by
absorption or reflection) as much light as the proportion of aperture they
cover, but also, by diffraction, misdirect another, similar portion of the
total light to make it miss its proper place in the Airy disk and form
spikes. Stan Freberg had a prejudice against spiders, but if you plan to
illustrate the star of, say, Bethlehem, diffraction spikes are de rigueur.
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