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Twilight At White Pond
USA

At twilight the light from the sky is vertically polarized in a band that runs overhead from horizon-to-horizon, at right angles to the sun.  Reflection from a water surface is horizontally polarized, with maximum effect when light grazes the surface at 37 degrees, Brewster's angle.  A dark patch appears as the vertically polarized light is refracted into the water to illuminate the bottom of the pond, but not reflected off the surface.

The image was made from the top a 22-foot high pole, and the Brewster's angle intercept with the water surface is about 29 feet away from the base.  Note that the dark patch is not seen when looking toward the sunset since the light is not strongly polalrized.

Gunther P. Konnen, a scientist specializing in atmospheric optics, suggested this panorama.

Copyright: John Wood
Type: Spherical
Resolution: 19696x9848
Taken: 24/09/2017
Geüpload: 25/09/2017
Published: 25/09/2017
Keer bekeken:

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Tags: concord massachusetts
More About USA

The United States is one of the most diverse countries on earth, jam packed full of amazing sights from St. Patrick's cathedral in New York to Mount Hollywood California.The Northeast region is where it all started. Thirteen British colonies fought the American Revolution from here and won their independence in the first successful colonial rebellion in history. Take a look at these rolling hills carpeted with foliage along the Hudson river here, north of New York City.The American south is known for its polite people and slow pace of life. Probably they move slowly because it's so hot. Southerners tend not to trust people from "up north" because they talk too fast. Here's a cemetery in Georgia where you can find graves of soldiers from the Civil War.The West Coast is sort of like another country that exists to make the east coast jealous. California is full of nothing but grizzly old miners digging for gold, a few gangster rappers, and then actors. That is to say, the West Coast functions as the imagination of the US, like a weird little brother who teases everybody then gets famous for making freaky art.The central part of the country is flat farmland all the way over to the Rocky Mountains. Up in the northwest corner you can find creative people in places like Portland and Seattle, along with awesome snowboarding and good beer. Text by Steve Smith.


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