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      <title>Post BAC - Principes généraux de la perception visuelle by christophe bailleul</title>
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      <description>Construisons le cours ensemble</description>
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         <description><![CDATA[<div>Lorsque l’on regarde au loin, la lumière traverse les lentilles de l’œil et se focalise sur la rétine. L’image nette qui se forme est transformée en influx nerveux et transmise au cerveau via le <strong>nerf optique</strong>.<br><br></div><div>Lorsque l’on regarde de près, <strong>le cristallin</strong> se déforme afin que l’œil fasse le point. L’image nette ainsi formée sur la rétine offre une vision nette de près.<br><br></div>]]></description>
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         <title>Photo</title>
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         <description><![CDATA[<div>Pour la qualifier, on définit la température de couleur (exprimée en Kelvins (K)). On parlera généralement de teinte chaude (température de couleur &lt; <strong>3 000 K</strong>) ou froide (température de couleur &gt; <strong>3 000 K</strong>). Plus une couleur est chaude visuellement, plus sa température thermique (en degré Kelvin) est donc faible.</div>]]></description>
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         <title>Photo</title>
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         <title>🐟</title>
         <author>aalexandra_lch</author>
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         <pubDate>2017-12-14 01:23:39 UTC</pubDate>
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         <author>reboursiere_antoine</author>
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         <description><![CDATA[<div>Une <strong>raie spectrale</strong> est une ligne sombre ou lumineuse dans un <a href="https://fr.m.wikipedia.org/wiki/Spectre_%C3%A9lectromagn%C3%A9tique">spectre électromagnétique</a> autrement uniforme et continu.</div>]]></description>
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         <author>julienratabour78</author>
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         <description><![CDATA[<div><strong>SPECTRES</strong> D’ÉMISSION - <strong>SPECTRES</strong> D'ABSORPTION DE LA <strong>LUMIÈRE </strong>VISIBLE. La spectroscopie est l'étude et l'interprétation des <strong>spectres</strong> de rayonnements.<br>Un <strong>spectre</strong> d'émission est un <strong>spectre</strong> produit par la <strong>lumière</strong> directement émise par une source (lampe à incandescence, corps chauffé, lampe à vapeur de sodium, une étoile…)</div>]]></description>
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         <author>jojodu919</author>
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         <description><![CDATA[<div>Particule élémentaire, de masse et de charge nulle, le photon est <strong>l’aspect corpusculaire</strong> de la lumière.</div>]]></description>
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         <title>Énergie d&#39;un photon</title>
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         <description><![CDATA[<div>&nbsp;<strong>Définition</strong> : La lumière est une <strong>onde</strong> électromagnétique transversale visible par l'être humain. Caractéristiques : - les <strong>ondes lumineuses</strong> se propagent en ligne droite; - lorsqu'elles rencontrent un obstacle, elles peuvent être réfléchies, réfractées (déviées) ou absorbées&nbsp;</div>]]></description>
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         <title>Relation longueur d&#39;onde fréquence</title>
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         <description><![CDATA[<div><br>lambda: longueur d'onde<br>f: fréquence<br>c: vitesse de la lumière 3.10^8 m/s</div>]]></description>
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