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2. Opaque data type - Wikipedia

   en.wikipedia.org/wiki/Opaque_data_type

   In computer science, an opaque data type is a data type whose concrete data structure is not defined in an interface. This enforces information hiding, since its values can only be manipulated by calling subroutines that have access to the missing information. The concrete representation of the type is hidden from its users, and the visible ...

3. Opacity - Wikipedia

   en.wikipedia.org/wiki/Opacity

   An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of cesia in an order system with three variables, including opacity, transparency and ...

4. Opacifier - Wikipedia

   en.wikipedia.org/wiki/Opacifier

   Tablet with opaque blister packaging. An opacifier is a substance added to a material in order to make the ensuing system opaque. An example of a chemical opacifier is titanium dioxide (TiO 2), which is used as an opacifier in paints, in paper, and in plastics. It has very high refraction index (rutile modification 2.7 and anatase modification ...

5. Transparency and translucency - Wikipedia

   en.wikipedia.org/wiki/Transparency_and_translucency

   Materials that allow the transmission of light waves through them are called optically transparent. Chemically pure (undoped) window glass and clean river or spring water are prime examples of this. Materials that do not allow the transmission of any light wave frequencies are called opaque. Such substances may have a chemical composition which ...

6. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   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 or slides), and from the epidiascope , which is capable of projecting ...

7. Optical window - Wikipedia

   en.wikipedia.org/wiki/Optical_window

   Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including visible light.. The optical window is the portion of the optical spectrum that is not blocked by the Earth's atmosphere.

8. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   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 ...

9. Opaque context - Wikipedia

   en.wikipedia.org/wiki/Opaque_context

   The term is used in philosophical theories of reference, and is to be contrasted with referentially transparent context.In rough outline: Opacity: "Mary believes that Cicero is a great orator" gives rise to an opaque context; although Cicero was also called 'Tully', [2] we can't simply substitute 'Tully' for 'Cicero' in this context ("Mary believes that Tully is a great orator") and guarantee ...