Two variations on the periscope theorem (Q2176438)
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| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Two variations on the periscope theorem |
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Two variations on the periscope theorem (English)
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4 May 2020
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The author presents two variations of the periscope theorem. A periscope is a system of two mirrors which reflect rays of light having a fixed direction to rays having the same direction. The periscope theorem says that the local diffeomorphism of the fronts is gradient. The author considers a spherical periscope as well as a reversed periscope. In both problems, the author describes the local diffeomorphisms of the fronts.
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periscope
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optical reflection
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projectively gradient vector field
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