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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.

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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.