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2. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.

3. Upside down goggles - Wikipedia

   en.wikipedia.org/wiki/Upside_down_goggles

   Objects viewed through such a device appear upside down and mirrored. They are constructed using sets of optical right-angle prisms, concave mirrors, or a mirror plus right-angle prisms with unequal cathethus.

4. Where to buy solar eclipse glasses and how to know if they're ...

   www.aol.com/lifestyle/solar-eclipse-glasses-2024...

   With sites like Amazon, Walmart, eBay and Temu flooded with counterfeit products more than ever before, it's confusing for consumers to know where to buy safe and tested eclipse glasses.

5. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.

6. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   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.

7. Crown glass (optics) - Wikipedia

   en.wikipedia.org/wiki/Crown_glass_(optics)

   BAK-4 barium crown glass (glass code 569560) has a higher index of refraction than BK7, and is used for prisms in high-end binoculars. In that application, it gives better image quality and a round exit pupil.