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When infrared light of these frequencies strikes an object, the energy is reflected or transmitted. If the object is transparent, then the light waves are passed on to neighboring atoms through the bulk of the material and re-emitted on the opposite side of the object. Such frequencies of light waves are said to be transmitted. [10] [11]
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).
The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope , which is capable of projecting images of both ...
Magical objects such as rings, cloaks and amulets can be worn to grant the wearer permanent invisibility (or temporary invisibility until the object is taken off). Magical potions can be consumed to grant temporary or permanent invisibility. Magic spells can be cast on people or objects, usually giving temporary invisibility.
This creates a pitted surface on one side of the glass pane and has the effect of rendering the glass translucent by scattering the light which passes through, thus blurring images while still transmitting light. It has 10–20% opacity. [citation needed] General applications include: To achieve visual privacy while still allowing light to pass ...
Lithophane of Frederick the Great, lit from front.After a well known painting by Julius Schrader (1849). [1] The same lithophane, backlit. A lithophane is a thin plaque of translucent material, normally porcelain, which has been moulded to varying thickness, such that when lit from behind the different thicknesses show as different shades, forming an image.
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
For example, glass inlays decorated the ionic capitals of north porch of the Erechtheion in the Athenian Acropolis. [16] Inlays were deeply rooted in the Egyptian glassmaking industry and their production, with the mosaic technique after the Pharaonic tradition, continued to flourish during the Hellenistic period with old or new repertories ...