Encore - Polarized Window Frost

September 29, 2018

Frostwithice2z (5)

Today and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

Photographer: Daniela Rapava
Summary Authors: Daniela Rapava; Jim Foster

February 2013 Viewer's Choice The photo above shows both frost crystals and two curious multi-colored ribbons on a window of my home in Rimavska Sobota, Slovakia. The variegated ribbons are drips of meltwater imaged using a circular polarizer lens. A polarizer filter or lens acts to recombine the two distinct rays of light that emerge when a beam of sunlight propagates through a slurry of partially frozen crystals as in this case. Because the rays were out of phase when recombined, the new rays contain nearly every visible wavelength. It should be noted that these colors might also be attributable to diffraction processes caused by minute cracks in the window glass. Photo taken on November 15, 2012. See also the Earth Science Picture of the Day for December 16, 2012.

Photo Details: Camera: Canon EOS 40D; Lens: EF100mm f/2.8 Macro USM; Filter: CPF; Focal Length: 100mm; Focus Distance: 0.56m; Aperture: f/3.5; Exposure Time: 0.017 s (1/60); ISO equiv: 800; Software: Adobe Photoshop CS5.1 Windows.