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navigation lights
navigation lights, the lights laid down by the International Regulations for Preventing Collisions at Sea which vessels must display when under way at sea at night. The most common are as follows:(a) A power-driven vessel under way at night, less than 46 metres (150 ft) in length, carries one white... Read more |
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characteristic
characteristic, the distinguishing qualities of a navigational light, whether from a lighthouse, lightship, light float, or lighted buoy, by which the navigator of a ship can easily identify it. In addition to their colours, white, red, yellow, or green, individual lights can be recognized by... Read more |
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Monochromatic light
Monochromatic Light Technologies using monochromatic light have a wide range of application, from astrophysics and astronomy to forensic science . The term monochromatic derives from the Greek words monos, meaning one or sole, and chromos, meaning color. Monochromatic light, or one-color light, is... Read more |
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color
color effect produced on the eye and its associated nerves by light waves of different wavelength or frequency. Light transmitted from an object to the eye stimulates the different color cones of the retina, thus making possible perception of various colors in the object. See also light ; ... Read more |
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primary colour
primary colour any of a group of colours from which all other colours can be obtained by mixing. The primary colours for pigments are red, blue, and yellow. The primary additive colours for light are red, green, and blue; the primary subtractive colours (which give the primary additive colours when... Read more |
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green flash
green flash or emerald flash, a refractive phenomenon of the atmosphere where the top edge of the setting (or, less frequently, rising) sun will momentarily turn emerald green. The green color lasts from a fraction of a second to two seconds. It is usually seen over a low distant horizon, such... Read more |
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rhodopsin
rhodopsin (visual purple) The light-sensitive pigment found in the rods of the vertebrate retina. It consists of a protein component, opsin, linked to a nonprotein chromophore, retinal (or retinene), a derivative of vitamin A. Light falling on the rod is absorbed by the retinal, which changes its... Read more |
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night blindness
night blindness inability to see normally in subdued light. It is usually a result of vitamin A deficiency. The rod cells, one of two light-sensitive areas of the retina of the eye , are impaired in their capacity to produce a chemical compound called rhodopsin, or visual purple, that is necessary... Read more |
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Ball-of-Light International Data Exchange
Ball-of-Light International Data Exchange (BOLIDE) A now-defunct project that shared and disseminated information relating to balls of light, with a wide scope of inquiry including ball-lightning, marsh lights, will o' the wisp, and séance room phenomena. The project coordinator was Hilary... Read more |
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Phytochrome
phytochrome A plant pigment that can detect the presence of absence of light and is involved in regulating many processes that are linked to day length (photoperiod), such as seed germination and initiation of flowering. It consists of a light-detecting portion, called a chromophore, linked to a... Read more |
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