Role of the eye in direct view of objects. The man is surrounded by a multitude of signals that carry information.ĭescartes' laws of refraction for radiation (one of the media being air).Ĭhange in the index of a transparent medium according to the radiation passing through it qualitative interpretation of the scattering of light by a prism.Ībsorption lines characteristic of an atom or ion. A transmitter (light source, sound source, transmitting antenna) transmits a signal that propagates this signal can be received by a receiver (eye, ear, receiving antenna). Sounds too intense have implications for the hearing. Magnitude of the speed of sound in air: 340 m / s. Sound travels in matter media (solid, liquid and gas) and it does not spread into space. Orders of magnitude of distances from Earth to a few stars and galaxies in the Universe or duration of propagation of light corresponding. Speed of light in vacuum (3x108 m / s or 300,000 km / s). The light can propagate in a vacuum and in transparent media like air, water and glass. Speed of light and sound, signal propagation Vision results from the formation of an image on the retina.Įxperimental approach to corrections of the defects of the eye (myopia, hyperopia). Safety: danger of direct observation of the sun through a converging lens. Principle of image formation in geometrical optics.Ĭoncentration of energy with the thin lens convergent. It heats up and transfers part of the energy received from outside the form of heat. Phases of the Moon, eclipses: simplified interpretation.īy absorbing light, the matter receives energy. Own shadow, shadow and shadow cone: interpretation in terms of light rays. ).Ī necessary condition for vision: the entrance of light into the eye.xistence de deux types de sources de lumière : Scattering objects (planets, satellites, white walls. In this website, from flash animations and interactive exercises.įor each course, an entertainment and exercise are possible.Įlectricity, chemistry, mechanics, optics are common themes at all levels. Links to html pages are allowed, and the viewing in The direct links to downloadable files on this site are Nesting, distribution, technical "inline linking" and "framing" Property Code Article, any reproduction of a full or partialĬontent of the site is prohibited, regardless of its form (breeding, ), logos are protected by copyrightĪnd are PCCL exclusive property.
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