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Blue Light (play)
Blue Light or Blue light may refer to: Science and technology * Portion of the visible spectrum related to the blue color ** Blue laser ** Blue LED * Cherenkov radiation, the physical phenomenon responsible for the characteristic blue glow in nuclear reactors * Blue light (pyrotechnic signal), a firework composition used for night-time signaling and illumination * Biological effects of high-energy visible light Military and emergency services * Blue Light (counter-terrorist subunit), a 1970s US counter-terrorist subunit of the 5th Special Forces Group * Blue lights, also known as blues and twos services, British emergency services * Blue lights, emergency telephone systems meant to deter crime, specially designed for use on campuses Arts, entertainment and media Film and television * The Blue Light (1932 film), ''The Blue Light'' (1932 film), a 1932 film directed by Leni Riefenstahl * The Blue Light (2003 film), ''The Blue Light'' (2003 film), a 2003 Japanese film directed by Y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue
Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective. Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
