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4-cours rayonnement

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I max / 2<br />

Angle de <strong>rayonnement</strong><br />

I max<br />

C’est est l’angle l angle formé form par 2 droites partant du<br />

centre du foyer lumineux et passant par les 2<br />

points de l’indicatrice l indicatrice d’intensit d intensité où<br />

α<br />

I = I max / 2<br />

10

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