Concentration of energy with the thin lens convergent. Safety: danger of direct observation of the sun through a converging lens. Vision results from the formation of an image on the retina.Experimental approach to corrections of the defects of the eye (myopia, hyperopia).
Analytical model: relations conjugation and thin converging lens magnification. Monochromatic light, polychromatic light, frequency and color.
Propagation of light in transparent media, index of the medium.
The elements of the site (Flash animations, video, ...), logos are protected by copyright and are PCCL exclusive property.
They may not be copied or used on another website than this one. 122-4 of the Intellectual Property Code Article, any reproduction of a full or partial content of the site is prohibited, regardless of its form (breeding, nesting, distribution, technical "inline linking" and "framing" ...).
Highlighting modes of vibration by sinusoidal excitation.
Simplified model of excitation of a column of air through a reed or a bevel : selection of frequencies emitted by the length of the air column.- Characteristics of the intermediate image and final image by building and / or application forms of conjugation. Gravitation governs the whole universe (solar system, stars and galaxies).Remote action exerted by the Earth on an object in its neighborhood: weight of a body.Electricity, chemistry, mechanics, optics are common themes at all levels.Existence of two types of light sources: - Primary sources (stars, sun ...); - Scattering objects (planets, satellites, white walls ...). Own shadow, shadow and shadow cone: interpretation in terms of light rays.Observation and location of images given by a convergent lens.