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en/13.3.5.md
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| + | ### Statement | ||
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| + | $13.3.5.$ [Insert the problem statement] | ||
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| + | ### Solution | ||
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| + | $13.3.5$ On the optical axis $AB$ of the collecting lens there is a flat mirror rotating with an angular velocity $\omega$ around the axis passing through point $A$ and perpendicular to the drawing plane. A parallel beam of rays falls on the mirror, which after reflection focuses on the screen. The focal length of the lens is $f$. Find the speed of the light spot on the screen at the moment when it crosses the optical axis. The screen plane is perpendicular to the optical axis. | ||
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| + | #### Answer | ||
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| + | [Insert a concise answer or boxed result] | ||
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| ### Statement | |||
| $13.3.5.$ [Insert the problem statement] | |||
| ### Solution | |||
| $13.3.5$ On the optical axis $AB$ of the collecting lens there is a flat mirror rotating with an angular velocity $\omega$ around the axis passing through point $A$ and perpendicular to the drawing plane. A parallel beam of rays falls on the mirror, which after reflection focuses on the screen. The focal length of the lens is $f$. Find the speed of the light spot on the screen at the moment when it crosses the optical axis. The screen plane is perpendicular to the optical axis. | |||
| #### Answer | |||
| [Insert a concise answer or boxed result] | |||