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2. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   A first-order lens has a focal length of 920 mm (36 + 1 ⁄ 4 in) and stands about 2.59 m (8 ft 6 in) high, and 1.8 m (6 ft) wide. The smallest (sixth) order has a focal length of 150 mm (6 in) and a height of 433 mm (17 + 1 ⁄ 16 in). The largest Fresnel lenses are called hyperradiant (or hyper-radial).

3. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

4. Reflex finder - Wikipedia

   en.wikipedia.org/wiki/Reflex_finder

   A reflex finder is a viewfinder system with a mirror placed behind a lens. The light passing through the lens is reflected by the mirror to a focusing screen, usually ground glass. The image formed on this ground glass can be observed directly, giving a waist-level reflex finder, or through a redressing optical device (set of mirrors or prism ...

5. Polarized 3D system - Wikipedia

   en.wikipedia.org/wiki/Polarized_3D_system

   A polarized 3D system uses polarization glasses to create the illusion of three-dimensional images by restricting the light that reaches each eye (an example of stereoscopy ). To present stereoscopic images and films, two images are projected superimposed onto the same screen or display through different polarizing filters.

6. Google Glass - Wikipedia

   en.wikipedia.org/wiki/Google_Glass

   Google Glass, or simply Glass, is a brand of smart glasses developed and sold by Google. It was developed by X (previously Google X), [9] with the mission of producing a ubiquitous computer . [1] Google Glass displays information to the wearer using a head-up display . [10]

7. Here's how to get free solar eclipse glasses in Texas and how ...

   www.aol.com/heres-free-solar-eclipse-glasses...

   Retail company Warby Parker is giving away free, ISO-certified solar glasses in preparation of the event. They will be available April 1 through April 8, or while supplies last. Click here to find ...