Just a cool pic this evening.
Maybe the skies will clear in a couple of days to allow imaging. It's been cloudy for a while now.
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Posted 19 May 2020 - 12:48 AM
Cool! And, and on the same theme ~astronomy, observatories, optics, telescopes and --- rainbows~ reminded me of these two pictures that I captured thirty four years ago! I was designing LPS Street Lights (for Europe) and consulting to KPNO/IDA regarding Light Pollution. Also spent a few days with Jim Wyant at his business, where interferometry and other optical metrologies were on the agenda, and Doug Sinclair flew in to cover Lens Design, and his viewfoils were terribly stuck together by static electricity! Then off to Meteor Crater and back home, where I wrote a White Paper on The Rainbow(s), as challenged by physicist George Sherman (I claimed I could derive the spectral radiance and polarization characteristics of the rainbows using only geometrical optics; he claimed that was impossible). Notice how the ~inside~ of the brighter bow is so much brighter than is the outside? All of that stuff came out of my analysis. My analysis was not able to predict the diffraction fringes, though. Those are caused by evanescent waves and better explained by Feynman's sum over histories, which is physical optics... not geometrical. I guess we were both right.
Ehhh... I forget a lot of stuff, but anything, anything optical --- I remember every last nit, absolutely everything, including people, places, the math... total obsessive-compulsive. What a life! Tom
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