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  2. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Non-volatile, i.e. no pronounced smell. Not depositing crystals on paper, i.e. not easily seen in glancing light. Invisible under ultraviolet light. Does not decompose or discolor the paper e.g. silver nitrate. Nonreactive with iodine, or with any of the other usual developers. Potential developers for the ink should be as few as possible.

  3. List of bra designs - Wikipedia

    en.wikipedia.org/wiki/List_of_bra_designs

    The bra's shape, coverage, functionality, fit, fashion, fabric, and color can vary widely. Some bras are designed to offer basic, practical support and coverage while others are purposefully sexual, sensual, or revealing. [1] Manufacturers' bra designs and styles constantly change.

  4. Nonimaging optics - Wikipedia

    en.wikipedia.org/wiki/Nonimaging_optics

    Nonimaging optics (also called anidolic optics) [1] [2] [3] is a branch of optics that is concerned with the optimal transfer of light radiation between a source and a target. . Unlike traditional imaging optics, the techniques involved do not attempt to form an image of the source; instead an optimized optical system for optimal radiative transfer from a source to a target is desi

  5. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    An example of this phenomenon is when clean air scatters blue light more than red light, and so the midday sky appears blue (apart from the area around the Sun which appears white because the light is not scattered as much). The optical window is also referred to as the "visible window" because it overlaps the human visible response spectrum.

  6. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Beam of sun light inside the cavity of Rocca ill'Abissu at Fondachelli-Fantina, Sicily. The speed of light in vacuum is defined to be exactly 299 792 458 m/s (approximately 186,282 miles per second). The fixed value of the speed of light in SI units results from the fact that the metre is now defined in terms of the speed of light.

  7. Divine light - Wikipedia

    en.wikipedia.org/wiki/Divine_light

    Effect of light from the rose window in Bari Cathedral, recurring in religious architecture to metaphorically allude to the spiritual light. [1]In theology, divine light (also called divine radiance or divine refulgence) is an aspect of divine presence perceived as light during a theophany or vision, or represented as such in allegory or metaphor.

  8. Opacity - Wikipedia

    en.wikipedia.org/wiki/Opacity

    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). Reflection can be diffuse, for example light reflecting off a white wall, or specular, for example light reflecting off a mirror. An opaque substance transmits no light, and ...

  9. Nonclassical light - Wikipedia

    en.wikipedia.org/wiki/Nonclassical_light

    Photon statistics of Nonclassical Light is Sub-Poissonian [1] in the sense that the average number of photons in a photodetection of this kind of light shows a standard deviation that is less than the mean number of the photons. Squeezed light exhibits reduced noise in one quadrature component. The most familiar kinds of squeezed light have ...