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  2. 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 ...

  3. 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 ...

  4. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra. [2] Scale diagram of Earth's shadow, showing how the umbral cone extends beyond the orbit of the Moon (The Moon is indicated by the yellow dot.) Earth's umbra, as seen during a partial lunar eclipse

  5. Lieberkühn reflector - Wikipedia

    en.wikipedia.org/wiki/Lieberkühn_reflector

    This allows illuminating an opaque object from the side of the objective, with the light source positioned behind the specimen as in a transmission microscope. The device is named after Johann Nathanael Lieberkühn (1711–1756) who used and popularized it but did not invent it. Similar mirrors were described and used by earlier microscopists ...

  6. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    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]

  7. Hidden-surface determination - Wikipedia

    en.wikipedia.org/wiki/Hidden-surface_determination

    Hidden-surface determination is a process by which surfaces that should not be visible to the user (for example, because they lie behind opaque objects such as walls) are prevented from being rendered. Despite advances in hardware capability, there is still a need for advanced rendering algorithms. The responsibility of a rendering engine is to ...

  8. 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 ...

  9. Opaque set - Wikipedia

    en.wikipedia.org/wiki/Opaque_set

    In discrete geometry, an opaque set is a system of curves or other set in the plane that blocks all lines of sight across a polygon, circle, or other shape. Opaque sets have also been called barriers, beam detectors, opaque covers, or (in cases where they have the form of a forest of line segments or other curves) opaque forests.

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