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Polarizing sheets are used in liquid-crystal displays, optical microscopes and sunglasses.Since Polaroid sheet is dichroic, it will absorb impinging light of one plane of polarization, so sunglasses will reduce the partially polarized light reflected from level surfaces such as windows and sheets of water, for example.
Herapathite's dichroic properties came to the attention of Sir David Brewster, and were later used by Edwin H. Land in 1929 to construct the first type of Polaroid sheet polarizer. He did this by embedding herapathite crystals in a polymer instead of growing a single large crystal.
However, this crystal is seldom used as a polarizer, since the dichroic effect is strongly wavelength dependent and the crystal appears coloured. Herapathite is also dichroic, and is not strongly coloured, but is difficult to grow in large crystals. A Polaroid polarizing filter functions similarly on an atomic scale to the wire-grid polarizer ...
Dichroism, in the second meaning above, occurs in liquid crystals due to either the optical anisotropy of the molecular structure or the presence of impurities or the presence of dichroic dyes. The latter is also called a guest–host effect .
A birefringent crystal is a material that has an optic axis ... the total amplitude for the x polarized photon to pass through the y-polaroid is the sum of the ...
The embedding of microscopic crystals of herapathite in a clear film was later patented by Edwin H. Land as a polarizing filter, under the name of Polaroid. References [ edit ]
In 1991, police discovered Jeffrey Dahmer had 84 polaroid photos depicting 17 murders he committed between 1978 to 1991. The act is shown in 'Monster: The Jeffrey Dahmer Story' on Netflix.
Their Polaroid filters, stapled over rectangular openings where the headlights ought to be, were very small. [ 12 ] Cardboard glasses with earpieces and larger filters were used to watch Bwana Devil , the feature-length color 3-D film that premiered on 26 November 1952 and ignited the brief but intense 3-D fad of the 1950s.