Polaroid sunglasses

Polaroid sheets are used to make Polaroid sunglasses. 

The two sheets of polarizing material shown have their axes aligned perpendicularly. Although each disk alone is almost transparent, the area where they overlap is opaque. You can duplicate this effect using two pairs of Polaroid sunglasses. 

FIGURE 4.18 A classic experiment using Polaroid sunglasses The first pair of sunglasses acts as a Nicol prism and transmits only plane-polarized light. If the second pair is held in the same orientation, light will still be transmitted. If it is held at 90° to the first pair, no light can be transmitted. 

The first programmable computer, the Zl, is developed by Konrad Zuse Sunglasses become polarized by Ray Ban using a Polaroid filter developed by Edwin H. Land Polyst5frene is developed... 

Seventy-five years later, in 1938, Edwin Land invented the sheet polarizer, called H-film, that has been industrialized as the Polaroid filter. Attached to the windows of ships and trains these filters can act as blinds, and they also have been widely used in polarized sunglasses. There was a time when Polaroid filters were considered as antiglare systems for large-scale windshield and headlights of cars [1]. 

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