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@ -187,10 +187,10 @@ Sont proposées les catégories suivantes, mais à débattre, toutes les idées |
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!* The first spherical refracting surface |
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! $`DS1`$ encountered by the light has |
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! the follwing characteristics :<br> |
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! $`\overline{S_1C_1}=+|R|=+5\;cm`$ , |
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! $`n_{ini}=1`$ and $`n_{fin}=1.5`$<br> |
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! $`\overline{S_1C_1}=+|R|=+5\;cm`$, |
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! $`n_{ini}=1`$ and $`n_{fin}=1.5`$. |
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! <br> |
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! * The second spherical refracting surface |
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! *The second spherical refracting surface |
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! $DS2$ encountered by the light has the follwing characteristics :<br> |
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! $`\overline{S_2C_2}=-|R|=-5\;cm`$ , |
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! $`n_{ini}=1.5`$ and $`n_{fin}=1`$ |
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@ -460,7 +460,7 @@ Sont proposées les catégories suivantes, mais à débattre, toutes les idées |
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!<summary> |
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! What is the apparent magnification of the cathedral ? |
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!</summary> |
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! * apparent magnification = angular magnification = magnifying power. |
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! * Apparent magnification = angular magnification = magnifying power. |
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! |
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! * As calculated previously, standing 400 metres from the cathedral, the 90 m heigh |
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! cathedral sustends the apparent angles of $`\alpha=arctan\left(\dfrac{90}{400}\right)=0.221\;rad=12.7°`$ |
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