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8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
The Prismatic World Tour was the third concert tour by American singer Katy Perry, in support of her fourth studio album, Prism (2013). The tour began on May 7, 2014, at Belfast, Northern Ireland's Odyssey Arena and ended on October 18, 2015, at Alajuela, Costa Rica's Parque Viva after six legs. [2]
Prism glass can be found on sidewalks, where it is known as vault lighting, [15] in windows, partitions, and canopies, where it is known as prism tiles, and as deck prisms, which were used to light spaces below deck on sailing ships. It could be highly ornamented; Frank Lloyd Wright created over forty different designs for prism tiles. [16]
However, it requires a significant increase in expense: even the low cost polarized glasses typically cost 50% more than comparable red-cyan filters, [16] and while anaglyph 3D films can be printed on one line of film, a polarized film was often done with a special set up that uses two projectors.
In a roof prism without a phase-correcting coating, s-polarized and p-polarized light each acquire a different geometric phase as they pass through the upper prism. When the two polarized components are recombined, interference between the s-polarized and p-polarized light results in a different intensity distribution perpendicular to the roof ...
The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion. [1]
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