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  2. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    An object may be not transparent either because it reflects the incoming light or because it absorbs the incoming light. Almost all solids reflect a part and absorb a part of the incoming light. When light falls onto a block of metal , it encounters atoms that are tightly packed in a regular lattice and a " sea of electrons " moving randomly ...

  3. Category:Transparent materials - Wikipedia

    en.wikipedia.org/wiki/Category:Transparent_materials

    Pages in category "Transparent materials" The following 45 pages are in this category, out of 45 total. This list may not reflect recent changes. ...

  4. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    A transparent object allows light to transmit or pass through. Conversely, an opaque object does not allow light to transmit through and instead reflecting or absorbing the light it receives. Most objects do not reflect or transmit light specularly and to some degree scatters the incoming light, which is called glossiness .

  5. AI reveals hidden objects in the dark - AOL

    www.aol.com/news/2018-12-12-ai-reveals-hidden...

    The team trained the network to look for transparent patterns in dark images by feeding it 10,000 purposefully dark, grainy and out-of-focus pictures as well as the patterns those pictures are ...

  6. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Colour constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset ...

  7. Opacity - Wikipedia

    en.wikipedia.org/wiki/Opacity

    An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted (also see refraction ).

  8. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    A burning apparatus consisting of two biconvex lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.

  9. Lustre (mineralogy) - Wikipedia

    en.wikipedia.org/wiki/Lustre_(mineralogy)

    Such minerals are transparent or translucent, and have a high refractive index (of 1.9 or more). [2] Minerals with a true adamantine lustre are uncommon, with examples including cerussite, zircon, and cubic zirconia. [2]