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  2. Cutaway drawing - Wikipedia

    en.wikipedia.org/wiki/Cutaway_drawing

    According to Diepstraten et al. (2003), "the purpose of a cutaway drawing is to allow the viewer to have a look into an otherwise solid opaque object. Instead of letting the inner object shine through the surrounding surface, parts of outside object are simply removed.

  3. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    Umbra, penumbra and antumbra of Earth and images that could be seen at some points in these areas (Note: the relative size and distance of the bodies shown are not to scale.)“… The Earth’s shadow has two distinct parts,… the UMBRA is the part of the shadow where all direct sunlight is blocked by the Earth; the PENUMBRA of the shadow is ...

  4. 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 ...

  5. Dodging and burning - Wikipedia

    en.wikipedia.org/wiki/Dodging_and_burning

    To burn-in a print, the print is first given normal exposure. Next, extra exposure is given to the area or areas that need to be darkened. A card or other opaque object is held between the enlarger lens and the photographic paper in such a way as to allow light to fall only on the portion of the scene to be darkened.

  6. Shadow - Wikipedia

    en.wikipedia.org/wiki/Shadow

    A shadow is a dark area on a surface where light from a light source is blocked by an object. In contrast, shade occupies the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.

  7. Can You Find the Hidden Objects in These Pictures? - AOL

    www.aol.com/hidden-objects-pictures-202637166.html

    The objective of this puzzle from UK-based fostering agency Perpetual Fostering is simple: Find the single witch hat among the cats. There are plenty of non-cat objects that stand out immediately ...

  8. 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]

  9. Mathematical descriptions of opacity - Wikipedia

    en.wikipedia.org/wiki/Mathematical_descriptions...

    An electromagnetic wave propagating in the +z-direction is conventionally described by the equation: (,) = ⁡ [()], where E 0 is a vector in the x-y plane, with the units of an electric field (the vector is in general a complex vector, to allow for all possible polarizations and phases);