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2. Crown glass (optics) - Wikipedia

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

   The borosilicate glass Schott BK7 (glass code 517642) is an extremely common crown glass, used in precision lenses. Borosilicates contain about 10% boric oxide, have good optical and mechanical characteristics, and are resistant to chemical and environmental damage.

3. Didymium - Wikipedia

   en.wikipedia.org/wiki/Didymium

   Didymium glasses. Didymium (Greek: δίδυμο, twin) is a mixture of the elements praseodymium and neodymium.It is used in safety glasses for glassblowing and blacksmithing and filter lenses for flame testing, especially with a gas ()-powered forge [why?], where it provides a filter that selectively blocks the yellowish light at 589 nm emitted by the hot sodium in the glass without having a ...

4. Horn-rimmed glasses - Wikipedia

   en.wikipedia.org/wiki/Horn-rimmed_glasses

   They are characterized by their bold appearance on the wearer's face, in contrast to metal frames, which appear less pronounced. Horn-rimmed glasses were one of the first styles of eyeglasses to become a popular fashion item, after comedian Harold Lloyd began wearing a round pair in his films. [1]

5. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   First-order rotating catadioptric Fresnel lens, dated 1870, displayed at the Musée national de la Marine, Paris.In this case the dioptric prisms (inside the bronze rings) and catadioptric prisms (outside) are arranged to concentrate the light from the central lamp into four revolving beams, seen by sailors as four flashes per revolution.

6. Dichroic prism - Wikipedia

   en.wikipedia.org/wiki/Dichroic_prism

   A trichroic prism assembly Dichroic prism. A dichroic prism is a prism that splits light into two beams of differing wavelengths (colour). [1] A trichroic prism assembly combines two dichroic prisms to split an image into 3 colours, typically as red, green and blue of the RGB colour model.

7. Amazon (company) - Wikipedia

   en.wikipedia.org/wiki/Amazon_(company)

   Amazon websites are country-specific (for example, amazon.com for the U.S. and amazon.co.uk for UK) though some offer international shipping. [49] Visits to amazon.com grew from 615 million annual visitors in 2008, [50] to more than 2 billion per month in 2022. [citation needed] The e-commerce platform is the 12th most visited website in the ...