Новое решение
en/13.1.19.md
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| + | ### Statement | ||
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| + | $13.1.19.$ [Insert the problem statement] | ||
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| + | ### Solution | ||
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| + | Knowing, that the focal length of a spherical Lens is $$\frac{R}{2}$$ | ||
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| + | #### Answer | ||
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| + | [Insert a concise answer or boxed result] | ||
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| ### Statement | |||
| $13.1.19.$ [Insert the problem statement] | |||
| ### Solution | |||
| Knowing, that the focal length of a spherical Lens is $$\frac{R}{2}$$ | |||
| #### Answer | |||
| [Insert a concise answer or boxed result] | |||