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Optique Géométrique - UVT e-doc - Université Virtuelle de Tunis

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1.2. Marche d’un rayon lumineux<br />

Exercices et problèmes<br />

. A<br />

S2<br />

. .A’<br />

A1<br />

2.1. Image A’’ <strong>de</strong> A :<br />

S<br />

A ⎯⎯→ 1<br />

A1<br />

S<br />

⎯⎯→ 2<br />

S A<br />

S1<br />

A2 ⎯⎯→ 1 S<br />

n<br />

1 1<br />

- Le dioptre S1 donne : = = n<br />

S1A<br />

1<br />

⇒ S 1A1<br />

= n S1 A<br />

- Le miroir S2 donne : S 2A2<br />

= - S 2A1<br />

= - ( S 2S1<br />

+ S 1A1<br />

)<br />

soit S 2A2<br />

= e - n S1 A<br />

S1A'<br />

' 1<br />

- Le dioptre S1 donne : =<br />

S1A<br />

2 n<br />

S1A 2 S1 S2<br />

S1 A''<br />

= =<br />

n<br />

+ S2A2<br />

n<br />

2e S1 A''<br />

=<br />

− n S1A<br />

n<br />

soit<br />

2 e<br />

S1 A''<br />

= - S1 A<br />

Distance AA ''<br />

: AA ''<br />

= AS 1 +<br />

e<br />

AA ''<br />

= 2 ( AS 1 + )<br />

n<br />

2.2. Marche d’un rayon lumineux :<br />

A<br />

S1<br />

n<br />

n<br />

n<br />

- 145 -<br />

A’’<br />

2 e<br />

n<br />

S2<br />

+ AS 1<br />

. .<br />

. .<br />

A1<br />

2.3. Miroir équivalent<br />

Miroir équivalent<br />

A’’<br />

A2

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