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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.Highlighted the phenomenon of dispersion of white light through a prism: the index of a transparent medium depends on the frequency of light. Image formed by a converging spherical mirror Summit, home, principal optical axis, focal length.Graphic constructions of the image: - An object plane perpendicular to the optical axis. Conjugation relations in algebraic form, magnification. Graphic constructions of the image: - An object plane perpendicular to the principal optical axis. Brief description and role of each component: condenser (spherical mirror), objective eye. Brief description and role of each component : - Telescope : objective eye.Orders of magnitude of distances from Earth to a few stars and galaxies in the Universe or duration of propagation of light corresponding.- Sound travels in matter media (solid, liquid and gas) and it does not spread into space. Sounds too intense have implications for the hearing.- The light can propagate in a vacuum and in transparent media like air, water and glass.Speed of light in vacuum (3x108 m / s or 300,000 km / s).

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Observation and location of images given by a convergent lens.

Geometric modeling of a thin lens convergent optical center, fireplaces, focal distance, vergence.

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.

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