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Commit b2d4f9e0 authored by Claude Meny's avatar Claude Meny
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Update cheatsheet.en.md

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    01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/02.new-course-overview/cheatsheet.en.md
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    ...@@ -66,7 +66,7 @@ with $V (\delta)=\dfrac{1}{f'(m)}$ ($f'$ being expresssed in m "meter" and $V$ i ...@@ -66,7 +66,7 @@ with $V (\delta)=\dfrac{1}{f'(m)}$ ($f'$ being expresssed in m "meter" and $V$ i
    ![](lens-divergent-N2-en.jpeg) ![](lens-divergent-N2-en.jpeg)
    * Characterized by :<br> * Characterized by :<br>
    \- **Focal lenght** (usually in cm) always <0 *+* adjective "**diverging**"<br> \- **Focal lenght** (usually in cm) always >0 *+* adjective "**diverging**"<br>
    &nbsp;&nbsp;or<br> &nbsp;&nbsp;or<br>
    \- Its **image focal length** $f'$ (in *algebraic value*, usually in cm), that is *negative $f'<0$*.<br> \- Its **image focal length** $f'$ (in *algebraic value*, usually in cm), that is *negative $f'<0$*.<br>
    &nbsp;&nbsp;or<br> &nbsp;&nbsp;or<br>
    ......
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